Were the Canela the Human Analog to the Bonobo?

From de Waal (2006) Bonobo Sex & Society, Sci Am 16:14-21

 In a recent set of lectures by primatologist Frans de Waal at the University of Alabama, two questions were asked by students that have got me thinking about bonobos & the Canela.  The first was something like, what would happen if chimps & bonobos were put together?  For those unfamiliar with the differences, bonobos (Pan paniscus) & chimps (Pan troglodytes) are different species in the same genus.  They share many similarities, & bonobos were until a few decades ago referred to as “pygmy chimpanzees,” because of their more gracile stature.  They are genetically distinct & reproductively isolated by the 3-mile wide Congo River that separates them.  They are both equally related to humans, as the Homo & Pan lineage diverged about 8 million years ago, with the chimp/bonobo divergence coming about 5 million years later.  However, what separates the bonobo & chimp in popular consciousness is the bonobo image as the “make-love-not-war” ape & chimps as the genocidal, war-like, or at least more aggressive variety.

The answer from de Waal was that the chimps would attack & kill the bonobos, as they are typically larger & stronger than bonobos.  

(Source: Sex and Physics blog)

While chimp females are also bigger than bonobo females, chimp males band together & would never let females do the same.  They would ruthlessly break up any such efforts.  Bonobo males don’t band together; they’re not that coordinated.  So bonobo females are in charge.  And a high status bonobo male is only big cheese until his mama dies, because bonobos are mama’s boys.  But don’t feel sorry for the bonobo male, says de Waal.  His life is not so bad.  He hangs outs, screws, eats, hangs out, gets a hand job, screws, hangs out.  Rough life, even at the bottom.  Chimp lives are much more high stress.

 The second question another student asked that got me thinking was, didn’t all the aggressive chimps in an African troop die off & leave behind a group of calm males that changed the tone of the troop?  That, pointed out de Waal, was actually a group of baboons studied by Robert Sapolsky.  Yes, indeed, the aggressive males would scavenge in the garbage dump of a tourist resort dump & picked up a nice virulent dose of tuberculosis.  But only virulent among the aggressive males who were eating the tainted meat (as I recall from reading A Primate’s Memoir).  Sapolsky killed & destroyed all the members who showed any signs of disease to try to contain the epidemic, fearing it would wipe out all the savanna baboons in the area, but it only took out the aggressive males & left a calm troop behind.  A decade later, the pacific culture persisted, though the original unaggressive males no longer remained.  These males displayed high rates of grooming, relaxed dominance hierarchy, low physiological stress among low-ranking males, transmission of culture, and female influence on transfer males to maintain this culture (Sapolsky & Share 2004).
 
Putting these two questions together, a third occurs to me:  What if the same happened to chimps?  Is the aggressive chimp & lascivious bonobo a result of similar cultural evolution?  Could we raise an aggressive bonobo or a hippy free-love chimp?  The extent to which they can be trained in captivity suggests we can, devastatingly scary & sad face-eating & hand-sheering incidents aside.  Furthermore, the domestication experiments with Arctic Gray Foxes in Siberia (see Dogs Decoded streaming on Netflix) suggest that such divergence may only take a few generations, not necessarily a million years.  Didn’t big game hunters & zoo keepers routinely lump bonobos & chimps together once upon a time, as they did Bornean & Sumatran orangutans?  Is this urban legend (like the humanzee)?  If not, what happened to them (someone, please do tell–best I can find is a comment referencing hybrids in a Belgian circus)?
 
How does this bring us to the Canela?  Who are the Canela?  Well, if we froze time (i.e., used the ethnographic present) around 60-100 years ago, they were possibly the human analog to our stereotype or gross characterization of the bonobo.  Funny, because we call them the analog to our empathic, compassionate , & permissively sexual selves (& chimps analogous to our hostile war-like selves); but really, we’re a rather prudish lot compared to the bonobos.  At our swinger-est, most orgiastic, we are a far cry from the bonobo.  Or maybe it’s just me.  I am a bit of a prude.  But, to my mind, we are too big a society with too much privacy to have the kind of sex the bonobos have.  In fact, the key seems to be privacy.  We have to much of it.  Privacy ruins everything.  As soon as we have a secret, it becomes dark, envy sets in, rumors spread.  If you have nothing to hide, then why keep a secret?  If you have something to hide, it must be something that will harm me, & therefore you are evil, you are selfish.  The ethos of the Canela in the ethnographic present written about by anthropologist William Crocker was generosity.  Sharing one’s possessions was held in the highest esteem & sharing one’s body was analogous.  The Canela are an Amazonian people, traditionally foragers, who utilized sex as a bonding mechanism.  Sound familiar?

Canela girl (from William H. Crocker Collection on Smithsonian website)

 
The core of the system involved extramarital & sequential sex, which provided plenty of sexual access to everyone.  Young girls would be considered married to the first young unattached male she gave her virginity to.  An unattached male is one who is not yet a father, unless he is just a “contributing” father.  A contributing father is one of the many husbands whose semen is contributed to the fetus thru sex after pregnancy.  The “social” father is the one in the picture when the child is born & who everyone then associates as the main provider for that female & child, though contributing fathers also help out.  After her marriage, the girl hangs with her husband for a few months & has a lot of sex with him but then begins to have trysts with others guys, who are then considered her other husbands.  Presently, she is ready for attachment to a men’s society, to which she provides sequential sex during ceremonies.  In these ceremonies, she may have sex with dozens of males.  With this, she is considered mature & her in-laws present her with a maturity belt, following which is her “free” period, in which she has as many extramarital affairs as she can manage with impunity from her in-laws, until her first child is born.  Once a child is born, she hunkers down with social primary father of that child & only has sex with other men during ceremonies & via the occasional surreptitious tryst.  
 

Canela girl etting marriage belt from in-laws (Crocker & Crocker 1994)

Why do females put up with this?  According to Crocker, it maintains the balance in the society.  Not all males are good at attracting extramarital affairs & only get it thru the ceremonies.  Therefore, providing ceremonial sex is considered beneficial to the morale of the tribe & brings great social esteem.  And it is the expected way to be accepted as a mature wife & mother.  And, well, a lot of them like it.  They like to be able to have extramarital affairs (see Buss & Meston’s Why Women Have Sex for the numerous non-proximal reasons women have sex that have nothing to do with babies or maximizing fitness–which frequently puts a cramp in the style of their respondants as much as it does that of the Canela girls).  A virgin girl is considered to be like a virgin forest–relatively useless.  This was once analogous to boys without pierced ears.  The ear was considered the way knowledge gets in the head.  To better facilitate this, a boy needed big, open ears.  Thus, they formerly observed a piercing rite of passage in which the boys’ ears were pierced & stretched to fit large plugs to make the boys compliant.  And girls found guys with big ear plugs extra knowledgable about–ahem–things (the same was true of the Iban, by the way, whose tattoos were once literally a resume of the sexual experiences they’d had & acts they were capable of, but we’ll come back to that in a future post).  

Canela boy getting pierced to open ears for knowledge & social compliance

 
What about the Canela guys sexual training?  At adolescence, they give their virginity to a post-menopausal women, who has been their “joking wife since they were little (joking friends typically mock each other’s genitals & sexual abilities whenever they encounter each other).  Afterward, they spend several years refraining from sex to devote their energies to learning other important things, like hunting, etc.  Then they have a relatively free period of sexual bounty, provided they have the charisma to obtain it.  Hence sequential ceremonial sex for those that don’t.  And, whereas girls were not generally forced to engage in sequential sex (they just would be socially ostracized if they didn’t), boys would be followed & monitored to ensure they went thru the sexual rites.  This sounds rather dark, but the monograph does a much better job of putting it in context than have I, starting as I have with the juicy sequential sex stuff & thoroughly exoticizing them, which actually comes at the end of the book.  Though in fairness, the author’s adolescent Canela “nieces” ask him how many women he has “seen” with his “big banana” since the last time they saw him, so the Canela’s sexual behavior is pretty thoroughly exoticized without my help.
 

Canela woman lampooning sex by wearing fake male genitals (Crocker 1994)

The portrait Crocker paints is one of a fun-loving, joking people.  They have elaborate friendship systems, as previously alluded to, where ribald humor holds center stage.  Depending on the rules of the friendship, there is no funnier joke than for a woman to grab at the penis or genitals of her friend or for the male to try to suck the breast or pull off the wraparound skirt of his friend.  It relieves some of the tensions between the sexes.  She squeals in delight or he appears abashed to the amusement of their families.  And this is key, as this is not done in private, but always in public, lest any joke go “too far.”  This takes center stage to the fascination of the children, who watch & absorb the tacit message that sex & joking is something that is fun & funny.

 
So are the Canela analogs to bonobos?  Well, they’re probably a lot different now.  The ear-piercing ritual started disappearing in the 1950s.  According to Crocker, the sexual openness of the Canela has slowly eroded over the past century, probably as direct result of the anthropological gaze.  He reports that, in the ’30s, the anthropologist Curt Nimuendaju intensively studied Canela sexuality, probably asking all manner of questions about why they did what they did, while he himself remained chaste & did none of these things.  Though Crocker considers his influence to have been generally positive, Nimuendaju’s implicit message was that he did not approve, leading them to conceal their practices from outsiders more than before.  If I were to interpret this withdraw, I might think he Canela got the message that they were interesting because they were different & did things we don’t do even though we can, thus making them self-conscious.  This is a bit Foucauldian, yes?  The magnitude of the lenses of science we focus on things like sexuality & sanity are greater when we are trying to understand what we consider aberrant than they are when we look to the so-called normal.  Thus, by drawing negative attention to it, we define it as abnormal with our very gaze.  In seeking to better understand, we ask for more clarity & draw attention to details that were scarcely noticed, pulling at the loose threads of a culture in the process, reifying “aberration” & destroying the “flow” of psyche & sexuality…There’s something to that.  
 
I also want to be careful about animalizing the Canela.  Just as we want to be careful anthropomorphizing the bonobo.  There’s certainly ecological relativity to sexual behaviors.  The Canela, interestingly, did not condone masturbation.  So, if you can’t masturbate & you’re not corset-wearing Victorians, an option is to have lots of intercourse (or at least it seems the logical alternative on the face of things–this feels a bit Freudian-hydraulic, but Crocker makes this insinuation so I will put it out there).  Bonobos, uh, do plenty of masturbating.  Also, the Canela did not condone homosexuality.  Although Crocker reports the presence of homosexual males, they are not homosexual in desire, as is the fixation of Euro-American sexual identity, but in gender roles.  They appear, more accurately, asexual in terms of desire.  The bonobos exhibit lots of sociosexual behavior, lots of different ways, with all the boys & the girls.  And the infants too.  Canela children may hear & see a lot of sex behavior & talk, but they do not generally engage in it until adolescence.  Finally, the Canela are humans, so they are changing.  As mentioned, they are & are not the people of Crocker’s book really, as the bulk of what seems so striking occurred early in his fieldwork, in the 1960s and 1970s.  They are susceptible to the influence of missionaries & traders & anthropologists & money & alcohol & probably iPhones now, just like the rest of us.
 
So what if we took a chimp & raised it as a bonobo?  What if we took your baby & raised it as a Canela?  I think de Waal’s point is clear, that other animals are more cultural than we care to admit.  The bonobos are not simply analogs of our sexuality any more than the chimps are models of our aggression.  They are both species capable of cultural development of empathy but perhaps just less flexibility.  They cannot change as quick as we can & as the baboons.  But all the same capacities lay in both, just a few generations removed.  And that all means that we can buy into this empathic revolution that people like Frans de Waal posit in his new book The Age of Empathy & economist Jeremy Rifkin outlines in The Empathetic Civilization.  Our problem is not that we need multiple generations for selection to work, we need time to infiltrate the private lives of our secret selves.  We need full disclosure.  We need no secrets.  We need to have our penises laughed at.  It’s hard because we are such a big society, but right here we have our blogs & other virtual forums where we can have our wraparound skirts yanked off & penises grabbed (in fun now, don’t let’s hurt anyone).  So what if Facebook exposes you to the world whenever they update their privacy whatchamacallits?!  What are you hiding back there anyway?  Show the world that you were front & center for a Spencer Tunick photograph, that you are featured on the Great Wall of Vagina
 
Go ahead…you first.
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Posted in Mating and Sexuality, Primates | Tagged , , | 3 Comments

ALLELE: Alabama Lectures on Life’s Evolution

At the University of Alabama, we just wrapped up our 2011-12 evolution lecture series, so, with that sense of completion, I wanted to share some highlights of why it is so worthwhile to host and attend such events.

We started off the series with evolutionary psychologist Brad Sagarin from Northern Illinois University. Dr. Sagarin’s was a rescheduled lecture from the previous year.  He had the unfortunate luck to be scheduled to speak on April 28, which had the rare distinction of being the day after a 1000-year tornado ripped thru our state & literally cut our town in half (meaning, a straight uninterrupted path diagonally from the SW corner thru to the NE corner, razing literally everything in between & sadly killing a whole bunch of good folks).  Not that it’s really relevant to this synopsis, but the anniversary of that event is coming up, so it’s sort of on our minds around here again.  Our communications infrastructure was severely hampered for a few days, so he flew in not knowing what to do.  I thought the tornado hit the airport so was surprised to hear that he’d made it that far, but the airport was fine, so there he was, waiting to come talk to us about sex differences in jealousy.  Anyway, he graciously rescheduled for the first lecture of the following season, which reviewed studies in evo psy on sexual interest on a college campus (please share the source of this with me if you know it), which turned out to be a good opener for the human sexuality course I teach in the spring. In the experiment, apparently, when male & female college students are propositioned by the opposite sex, there is of course a high rate of “no” from one sex. And not just “no,” but an emphatic & often angry “no.” Guess which sex? Right. From the other sex, of course, the answer is often of the affirmative variety. But what was most interesting is that when the answer from that variety (er, guys) is “no,” it’s often an apologetic one. As in, “I’m sorry, but I have a girlfriend/wife/have class right now (but maybe later?).” So girls have no problem telling horn-dog guys to piss off when randomly propositioned by strangers on campus; guys are sorry if they’re not willing to bed a total nutter they’ve never met down in the grass to do it right there.   Basically.  Good stuff. But even better was when Dr. Sagarin visited my research group the next day to chat with my students about another project he’s got underway. Apparently–& gawd I wish I’d written the details down at the time so I’d get this right–he’s doing an ethological study of an S&M community that includes taking saliva samples before & after the events to measure the influence of domination versus submission on cortisol profiles. So.friggin’.cool!

The next lecture was by evolutionary biologist Paul Ewald from the University of Louisville.  Given the amount of breath I spend talking about evolutionary medicine, I should have already been familiar with Dr. Ewald’s work, but shamefully I wasn’t.  What I liked in particular about his talk was that, unlike several previous lectures, which have been basic talks to a lay audience, Dr. Ewald presented a synthesis of data that was new to many of us involved in hosting the series.  The downside of that, of course, is that perhaps it shot over the heads of some of the undergrads we oblige to attend.  The most fascinating thing about Dr. Ewald’s talk was the pattern he has found with regard to certain cancers & infectious disease, in particular infections like mononucleosis & herpes.  His hypothesis that certain sexual behaviors may be associated with higher risk for these diseases & the corresponding cancers was a bit finger-waggingly toward the students, which I think alarmed them a bit.  However, I sat there thinking about the implications for the recent pattern found by Fincher & Thornhill with regard to positive associations between global distributions of infectious disease biodiversity & cultural diversity (e.g., the association between “assortative sociality,” religious diversity, & pathogenic biodiversity).  Would we see lower rates of kissing among cultures where infectious disease rates are higher?  I had been reading William Crocker’s monograph on the Canela of Amazonia in preparation for assigning it & recalled that, though they engage in a lot of what we would consider promiscuous sexual behavior, there was mention of their aversion to kissing.  Worth following up on…

In January, we had the pleasure of a double-header.  By screening filmmaker & health educator Greta Schiller’s No Dinosaurs in Heaven, we were also able to get a visit & lecture by National Center for Science Education executive director Eugenie  Scott.  I had hoped to spend some time chatting Genie up on the drive from the airport, as I had volunteered to pick her up, but her flights got interminably screwed up (I believe she was stranded in Houston for 24 hours, forced to sleep in a chair for her trouble).  However, since Spring semester speakers are integrated into our “Evolution for Everyone” course, which is the intro course to our interdisciplinary EvoS minor, I got the chance to talk informally with Dr. Scott with my students, have lunch & dinner with her & Greta, drive them around town (in my car with a split tire I realized later–they politely but probably nervously never mentioned the continual bumping), & host a second talk by Dr. Scott for the Anthropology Department.  I later regreted not sharing her with another department, since it was like preaching to the choir in our department, but I had a greedy moment (or a few).

Eugenie Scott is trained as a biological anthropologist after all, but what made it greedy is that we got the very next speaker for an Anthropology Department talk too, or so I thought.  Dr. Brian Fagan, professor emeritus from UC-Santa Barbara, writes popular books on archaeology (& has published around 50 at last count!).  As it turned out, he didn’t plan on giving a 2nd department talk, but I invited so many people to sit in on the “Evolution for Everyone” class that it turned out that way.  What was ironic is that Dr. Fagan has written books on, among other things, Cro-Magnons & the Ice Ages & is currently focused on the role of water in human cultural change but did not consider himself to have enough expertise on evolution to speak to it directly.  However, from my perspective, the Malthusian problems he discussed with regard to the world’s current water situation are spot-on Darwinian in scope.  Nevertheless, what blew my mind the most was a reading of his from his edited volume on the Ice Age that I assigned students to read.  It lays out the mechanics for how the Neolithic Revolution would have taken root, which I’d never encountered before.  Apparently, during the Ice Age, cereals & nut trees tended to only thrive at water’s edge because it was too cold at higher altitudes.  However, the water was so sandy that they didn’t thrive down there.  With the warming of the climate at the end of the Ice Age, they could then grow at nower warmer higher altitudes where the clay soils were more fertile.  This led them to thrive & be more abundant & for humans to make extensive use of them, perhaps becoming relatively sedentary foragers, as we generally characterize NW coast Native Americans.  However, when the climate began changing again, becoming drier & reducing available water, people panicked as these crops began disappearing.  So they may have transplanted these staples of their diets & moved them closer to the remaining water sources & even figured out how to manually get water to these plants to ensure they maximized their water & food resources.  This is an ingenious ‘just so’ story with regard to how domestication might have been motivated by climate change.

In March we were visited by paleontologist Ryosuke Motani from UC Davis.  I had less interaction with Dr. Motani than with the others (this hosting stuff is glamorous & all, but it does get a bit tiring, what with the publish or perish thing always breathing down our throats & that other teaching thing & me always overfilling my plate anyway).  Dr. Motani did give two talks while he was here & visited my class.  Since I have students attend as many lectures as possible & bribe them to do so by offering extra credit for write-ups of the event, I actually have a report from a student, Malia Bunt, who happens to currently be our go-to EvoS student.  She conveys the impact of Dr. Motani’s Geology Department seminar talk (which came before his ALLELE talk) far better than could I:  “Firstly, I would like to say that Motani has excellent speaking abilities. His ideas were clearly and consistently put forward. The lecture encouraged me to enroll in a statistics class at some point before graduation because I had trouble accepting his conclusions as I did not understand his results. Motani discussed the activity patterns of mesozoic creatures (nocturnal, diurnal, or cathemeral). He determined this by eliminating phylogenetic biases–which is basically like saying since this guy is related to this guy, he must be nocturnal too–to get at the actual truth. I found his methods interesting, as in another class we just finished an extensive discussion of accuracy, validity, precision, and reliability. It was refreshing to see these concepts put forth. Motani’s conclusions were that form-function assumptions are subject to phylogenetic noise and that activity patterns were subject to ecology. He found that large or medium dinosaurs were cathermal because they need more time to eat as they consume more energy. He also found that small carnivores were nocturnal which in reminiscient for me of small prosimians and their large eyes. It was interesting to hear that Archaeopteryx was most likely diurnal. We discussed Archaeopteryx and its role as a possible transitional fossil in another class earlier this semester, so it was neat to actually see something I recognized. I wish that I understood more about statistics because I feel it would have helped me understand Montani’s lecture even more, but he was such as great speaker that he helped fill in most of the blanks. Also, I learned about dinosaur mummies which are officially my new obsession. http://www.wired.com/science/discoveries/news/2007/12/dino_mummy SO COOL!”

Finally, with no disrespect intended to any other speaker, my favorite of all was the very last, Dr. Frans de Waal.  Although he is a biologist working in a psychology department, Dr. de Waal is, in my opinion, among the foremost authorities in the world on chimpanzee & bonobo behavior & cognition.  I was fortunate to be turned on to his work in grad school by another researcher I place on a pedestal, Dr. Helen Fisher, & was practically giddy to meet him.  Consequently, I made a bit of an ass out of myself by promptly telling him about our proposed study of bonobo cunnilingus & asking him if he’d observed any.  Even though he’s technically “the bonobo sex guy,” I think he thought me a bit weird.  BUT, what was so cool is that, again, he pulled a spare lecture out of his pocket for my students & reviewed much of the literature–much of it generated by him & his students–on the evidence for culture in non-human primates.  And he has so much previously unreleased video & photographic footage for use in his talks.  That was such a treat.  Perhaps the most memorable clip of all time, which he narrated, was one of a female bonobo with her infant on her back & an adolescent male.  I am paraphrasing Dr. de Waal, but it essentially went, “The female is going to masturbate the male.  He is a young male, like a teenager.  Here she is masturbating him.  It is very quick, these things are always very quick, & the males rarely ejaculate.  Of course they ejaculate sometimes or there’d be no bonobos, but in these social encounters they rarely ejaculate.  Then the female mounts the male, but she mounts him like a female as you see, rubbing back & forth.  Females do this to each other, which we call ‘g-g rubbing’ or genital genital rubbing.  Then there is some penetration, but it quick again, you see.  Then they are done.  Then the male makes sure to maturbate the infant, you see.  Everyone gets some sex.”  His talk that night had great attendance & was a total package.  Really.  Check out his current TedTalk for a taste, as it is a condensed version of the one hour-version we enjoyed.  He presents fresh data, has a central theme, is funny, & his monkeys & apes are funny & charismatic (the capuchin experiment about “fairness” [the "Occupy Wall Street" experiment] by Bronson brought the house down!).  And the data from Joshua Plotkin’s studies of cooperation & mirror self-recognition in elephants is thoroughly convincing.  I was a disbeliever in anything but chimps, bonobos, & orangs passing & didn’t find the Bronx Zoo experiments convincing, but the new video footage from the experiments in Thailand made an elephant self-recognition (& maybe self-awareness) believer out of me.  And we had several boxes of Dr. de Waal’s books available for on-site sales & signing & they almost all sold out.  Whew!  He looked good, we looked good, all good!

So, though I am looking forward to catching my breath, I am also looking forward to next year.  We have biological anthropologist John Hawks from the University of Wisconsin (check out his great blog here) confirmed & evolutionary biologist from UC-Riverside Marlene Zuk almost confirmed.  We also have maybes from, among others, vertebrate paleontologist Bruce MacFadden from the University of Florida.  It looks to be another great season of great talks & my babbling hero-worship!

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Bayesian Statistics is Not Esoteric! It’s Groovy!

This past weekend, I attended an introductory talk and workshop on Bayesian statistics at Vassar given by Indian University professor John Kruschke. Before I go on, I’d like to make three points very clear:

1) This post isn’t so much about evolutionary clinical psych per se, but it has relevance for anyone doing any type of research which uses statistics.

2) Going into this workshop, my statistical skills and knowledge set would rank about a 4.5 on a 10 point scale, with 10 being a statistical genius—which brings me to my third point:

3) John Kruschke is an extraordinarily good instructor, and if you get the chance, you should see him speak, buy his highly-Amazon-rated book (the book’s lowest rating is 4 stars and is titled “Amazing”), and/or read his papers on Bayesian stats…I understood almost every word he said, even though I’m only a stats novice, when it comes right down to it. I found Bayesian statistics to be a lot simpler than I had expected, in large part due to Dr. Kruschke’s style.

So….Bayesian statistics is an alternate approach to traditional Null Hypothesis Significant Testing (NHST) which is the standard method that everybody learns when first learning statistics. Almost everybody uses it when they analyze data and publish papers, making it in essence the standard way statistics has been done ever since Ronald Fisher expounded it in the early 20th century: calculate a statistic (a mean, for example) from your model that may or may not represent the population mean…then, based on sample size, method of data collection, and a number of other factors, you come up with a p (significance) value to decide whether to reject the null (i.e., conclude that the populations you are comparing are different), or not (i.e., fail to conclude that there is a difference).

The problem with NHST is that the p value is a goalpost that can be too easily moved, both unintentionally and intentionally, depending on the researcher’s goals, aims, collection/analysis methods, and agenda. Since the decision to reject or accept a null hypothesis based on significance is thought of as a binary decision, it is dismaying easily to get diametrically opposite results (accept vs. reject null hypothesis) with a single set of data.

In a simple example demonstrated by Dr. Kruschke, the critical value in a t-test can shift depending on whether you intend to collect data until you reach a particular N (number of subjects) OR if you intend to collect data until a particular time (e.g., Friday at 5:00pm). (I think the reason for this is that degrees of freedom are calculated differently in the latter scenario, but I could be wrong.) So with a single data set and a single t value, you can either reject or accept the null! Which is the correct answer??

Enter Bayesian statistics, which is based on distributions of probability (also known as credibility within the field). Rather than a statistic and a significance value (the latter of which is, again, fickle) as in NSHT, the output of a Bayesian analysis (see Figure 1) is a value (in this example, a difference of means between groups A and B, 1.02) which purports to describe the population parameter, and a probability distribution that describes a range of likelihoods of similar values (shown by the histogram). The high-density area (HDI) is the range of values in which there is a 95% of the true mean falling. You can see that zero lies well outside the HDI, and the green numbers tell us that there is a 98.9% chance that the true difference of means is greater than 0. Based on this, we can make a probabilistic decision to reject or accept the null (rejection is obviously the more probable decision), but the point is, the findings are what they are…anybody running this analysis with this data will get the same outcome, which is more than can be said for the p value.

That’s it! Look how simple and elegant, yet information-rich this result is compared to an NHST result. The HDI is reminiscent of a confidence interval in NHST, yet a CI has no probabilistic distributional information about the values within, whereas the HDI does. NHST is also dependent on assumptions of normality and very sensitive to outliers. It also relies on confusing concepts of sampling distributions which Bayesian approaches do not need. Further, Bayesian stats utilizes a prior probability, which the current data updates to result in a posterior credibility; purposely vague priors (like uniform distributions) are often used, but if there is a theoretical basis for it, a prior can be used which incorporates probabilistic information from prior findings. This type of analysis would make it a lot less easy to find a significant effect for pseudo-scientific/paranormal phenomena, considering the thousands of negative prior results that could be loaded into a current analysis of, say, psi effects (see Wagenmakers, et al.)

In fact, there’s a whole litany of reasons why Bayesian stats is superior to NHST. It’s the way of the future, if Bayesians are to be believed. So why hasn’t it caught on yet?

The most probable answer, in my opinion, is that the best way to do Bayesian analysis right now is with the statistical language R, which has a sickeningly steep learning curve for those not used to programming languages or syntax. Here’s part of the code for a One-Way ANOVA:

Compared to even the quasi-intuitive menus and graphical interface of SPSS, it’s enough to give anyone a case of the vapors. By all accounts, R is much more flexible and versatile than any of the existing stats softwares, but it really doesn’t have mass appeal right now. In a few years, somebody will have put together a menu-based graphic user interface to sit over R, but for now, the best we have is RStudio, which is free to all and has a large online user support network, but still necessitates learning the R language.

There’s also the issue of institutional inertia; most current publications utilize standard NSHT. If/when more people start using Bayesian stats, there will be a bandwagon effect, especially if journals actively encourage Bayesian approaches.

By the way, there were a couple of resistant audience members in the back of the room who weren’t convinced that Bayesian methods were better, openly challenging Kruschke in the middle of his lecture (only ten minutes in, rather than waiting for the Q&A, which I thought demonstrated egregiously poor decorum) and muttering like Statler and Waldorf to each other as he proceeded. My inference was that some people actively resist Bayesian approaches because they either feel NHST is superior or they are direct descendents of Ronald Fisher. Feel free to comment and explain yourself if you’re in this camp.

For now, I’m going to predict that eventually, Bayesian stats will be easy enough for everyone to use…in the meantime, I encourage everyone to at least look into it.

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The Evolution Paradox in Higher Education (Or how I had to buck up and teach myself this evolution stuff!)

As I’ve written in several of my publications, evolution is under attack. But not only by religious fundamentalists, who may reject evolution outright due to conflicts regarding the origins of life. This particular rejection is sort of the high-profile rejection of evolution that tends to make the media.

From my vantage point, rejection of evolution (or, more specifically, rejection of certain applications of evolution) from academics in a broad sense – which is just as strong as rejection from religious fundamentalists – may well be the primary obstacle to the advancement of furthering knowledge – particularly when it comes to understanding humans (see Geher, 2006a; Geher, 2006b; Geher & Gambacorta, 2010).

In short, academics in many fields reject applications of evolution in regard to what it means to be human – often taking the stance that evolutionary accounts of human behavior are “deterministic” and perhaps politically driven to maintain existing social inequities. In short, many academics see evolutionary applications to human affairs as part of a right-wing conservative conspiracy.

Of course, from where I stand, nothing could be further from truth. Like any set of intellectual ideas, evolution can be used for all kinds of purposes. As the single most powerful set of ideas in the life sciences, individuals who are interested in improving society and helping improve the human condition writ large would be foolish to ignore this perspective. Ignoring evolution in attempts to understand human behavior would be akin to ignoring a road map (or GPS?) when trying to drive from Washington, DC to upstate New York.  And several scholars have shown that evolutionary applications to human affairs can help us improve so many things about human life, from the quality of neighborhoods in cities (see Wilson, 2011) to diet and exercise regimens that improve all facets of physical and mental health (see Platek, Geher, Heywood, Stapell, Waters, & Porter, 2011).

An additional factor to consider pertains to the immense popularity of evolutionary psychology (i.e., evolution applied to human behavior). As chair of the psychology department at SUNY New Paltz, I can say confidently that courses in evolutionary psychology fill up quickly and that students consistently want more of it. And evolutionary psychology has become something of a media darling – becoming disproportionately represented in media outlets of all shapes and sizes (see Fisher, Kruger, & Garcia, 2011).

So there’s the “Evolution Paradox in Higher Education” in a nutshell. Most academics are highly resistant to evolution applied to our own species. Meanwhile, students eat this stuff up and yearn for more – and the media (and the lay population generally) can’t seem to get enough of it either!

Which leads me to an existential question that underlies higher education in a broad manner. Should institutions of higher education be obliged to offer curricular experiences that match student interest? If students want to learn about evolutionary psychology, then should a college or university adjust its curriculum to match this demand? This issue can be addressed from a strict economic standpoint (supply and demand) – but it can also be addressed from the standpoint of “what comprises an appropriate liberal art education” (as it’s often put on my own campus). Do academics know best what “should” and “should not” be taught? And, if one accepts this premise, should they let this expertise single-handedly drive curriculum? And what about when academics disagree with one another in this regard (it could happen!)? I’m not going to answer these questions here – I just want someone other than me to think about this stuff!

In my most recent publication, co-authored with Dan Glass and David Sloan Wilson (Glass, Wilson, & Geher, 2012), we explore data regarding the evolution training of evolutionists who study human behavior. In the population of articles published in one of our top-tier journals, Behavioral and Brain Sciences, published between 2001 and 2004, articles were analyzed (based on key word searches) for content related to evolution. 31.5% of these articles clearly related to evolutionary content. So, in case you’re wondering, YES, evolution has arrived in the behavioral sciences.

David contacted all of these first authors – 27 of 46 responded to a brief survey regarding their perceptions of evolution training in higher education. The article is brief and straightforward enough, so I’ll just highlight here. Most authors described their own evolution education as self-training – that came mostly after they completed their PhDs. Further, most authors say that it was difficult-to-impossible to learn about evolution applied to humans at their PhD-granting institution – and they say that the scenario is no better at their current institution.

So just to put the pieces all together:

1. Students at colleges and universities yearn to learn about evolutionary psychology.

2. The media and laypeople all around the world eat evolutionary psychology up.

3. Evolutionary approaches to human behavior famously have shed light on important issues of the human condition.

4. In spite of points 1-3, academic institutions are highly resistant to expanding curricular offerings related to evolution in areas that pertain to humanity.

5. Point #4 is echoed in our new publication, showing that even those evolutionists who publish in the most esteemed psychology journals find evolution education extremely hard to come by in the Ivory Tower (or, as David Wilson calls it, the Ivory Archipelago due to the lack of connections across academic subfields).

As I’ve written in several pieces, one solution to this all may be to put evolution in a broader curricular context – by creating an interdisciplinary evolutionary studies (EvoS) program. This idea, which started at Binghamton – and then SUNY New Paltz – has received major funding by the NSF and is now starting to slowly spread to other campuses around the world (Albright College, University of Alabama, University of Missouri, University of Lisbon … and more!). Putting evolutionary applications to human affairs in a broader, interdisciplinary context may well hold a key to helping this approach to humans reach its potential (Garcia, Geher, Crosier, Saad, Gambacorta, Johnsen & Pranckitas, 2011).

In any case, if you believe, as I clearly do, that applying evolutionary principles to issues of the human condition is integral to helping advance our understanding of what it means to be human, you have reason for a nice panoply of emotions – outrage (academics are generally resistant to this approach), intrigue (students and lay audiences are fascinated by this approach), and hope (the interdisciplinary EvoS approach to education may well hold the key to allowing evolution to reach its potential in helping shed light on the human condition). As with anything, we’ll just have to wait and see what the future holds.

References

Fisher, M., Kruger, D. & Garcia, J. (2011). Understanding and enhancing the role of the mass media in evolutionary psychology education. Special issue of Journal of the Evolutionary Studies Consortium, 4(1), 75-82.

JR Garcia, G Geher, B Crosier, G Saad, D Gambacorta, L Johnsen & E Pranckitas. (2011). The interdisciplinary context of evolutionary approaches to human behavior: a key to survival in the ivory archipelago. Futures, 43, 749-761.

Geher, G., & Gambacorta, D. (2010). Evolution is not relevant to sex differences in humans because I want it that way! Evidence for the politicization of human evolutionary psychology. EvoS Journal: The Journal of the Evolutionary Studies Consortium, 2(1), 32-47.

Geher, G. (2006). An Evolutionary Basis to Behavioral Differences between Cats and Dogs? An Almost-Serious Scholarly Debate. Entelechy: Mind and Culture.

Geher, G. (2006). Evolutionary psychology is not evil … and here’s why …Psihologijske Teme (Psychological Topics); Special Issue on Evolutionary Psychology, 15, 181-202.

Glass, D.J., Wilson, D.S., & Geher, G. (2012). Evolutionary training in relation to human affairs is sorely lacking in higher education. EvoS Journal: The Journal of the Evolutionary Studies Consortium, 4(2), 16-22.

Platek, S., Geher, G., Heywood, L., Stapell, H., Porter, R., & Waters, T. (2011). Walking the walk to teach the talk: Implementing ancestral lifestyle changes as the newest tool in evolutionary studies. Evolution: Education & Outreach, 4, 41-51. Special issue on EvoS Consortium (R. Chang, G. Geher, J. Waldo, & D. S. Wilson, Eds).

Wilson, D. S. (2011). The neighborhood project. New York: Little Brown and Company.

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(Food Erections, Gorilla Prozac, Bonobo Cunnilingus &) Apes in & at the Nashville Zoo

This gallery contains 11 photos.

Zoos are one of those concessions to the limits of consciousness I both regularly support & by which I am slightly horrified.  Humans don’t have enough empathy to extend to all the furry & scaly creatures out there w/o caging … Continue reading

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WHY CAESAR’S WIFE MUST BE ABOVE SUSPICION: MATES FUNCTION AS HONEST INDICATORS OF STATUS AND PRESTIGE. BY BEN AND BO WINEGARD.

In Plutarch’s Life of Julius Caesar, a story is related that Julius Caesar divorced his wife (Pompeia) because of rumors of opprobrious behavior. At trial, Caesar said he knew nothing about his wife’s rumored adultery, but asserted that he divorced her because his wife “ought not even be under suspicion” (The Life of Caesar, 9-10). In a sense, what Caesar was asserting was that he would not allow his wife’s suspected behaviors to sully his status, reputation, and prestige. At the time, Caesar was a powerful and ambitious political player (Pontifex Maximus), and he did not want his career thwarted by rumors of his mate’s turpitudinous behavior. But why should Pompeia’s behavior affect his reputation? For several years, we (the authors) have been thinking about this and similar issues, and have, we believe, come to a reasonably accurate solution. In what follows, we will attempt to explain why men and women flaunt (show off) and conceal (hide) mates; why they are sensitively attuned to their mates’–and potential mates’–reputations; and why they are attracted to highly desired mates, often exerting enormous effort to obtain and sustain a relationship with them, despite little evidence that such efforts make evolutionary sense from traditional mate choice perspectives. Some of what we say is speculative, some is currently being tested, and some is supported by solid data. All of it, however, follows from cogent theoretical (Darwinian) logic. We call our theory the positional goods and social information (PGSI) theory of human mating.

 

THE RISE OF THE STANDARD PARADIGM

Evolution: Natural Selection and Sexual Selection

Modern theories of human mate choice stem from Darwin’s twin theories of natural and sexual selection (1859/1958; 1871; Larson, 2005). Although Darwin was not the first thinker to propose that life evolves, he was the first to propound a theory of evolution that included a plausible mechanism (natural selection). Darwin’s theory is elegantly parsimonious and can be reduced to three basic principles: 1) Organisms vary in their ability to reproduce. 2) Offspring inherit traits from their parents. 3) More organisms are born than will survive to reproduce. The statistical result of this process is a pool of fitter organisms, and the long term effect is the evolution of a variegated ecosystem of organisms, including humans. Later, Darwin (1871) proposed another mechanism of evolutionary change that can be distinguished from natural selection proper: sexual selection. According to Darwin, organisms not only compete for a limited pool of resources and struggle against the environment to procure them, they also compete for a limited pool of potential mates and struggle against conspecifics to obtain them. The processes of sexual selection lead to the formation of traits that enhance an organism’s ability to compete against same-sex rivals (intrasexual selection) and to traits that enhance an organism’s ability to attract opposite-sex mates (intersexual selection).

Although Darwin was flummoxed about the role that beauty played in the evolution of human mating– perhaps relying too much on disparate and inaccurate information from colonialists–modern theories of human mate choice all take Darwinian principles for granted (Grammar, Fink, Moller, & Thornhill, 2003). Furthermore, Darwin noted an important puzzle about human mating behavior that the PGSI takes seriously: women seem to be the decorated sex in humans, using their secondary sexual characteristics (breasts, lips, buttocks) to “charm,” “fascinate,” and “allure” men. This is rare, inverting the standard pattern found in nature.

Parental Investment: Bateman and Trivers

Although Darwin noted that in humans women seem to be the decorated sex, he also noted that in most species, females were “choosier” and that males were more eager to engage in frequent copulations. He did not forward a satisfactory reason for this observation. Some seventy years later, A. J. Bateman (1948) provided one. In an experiment with fruit flies, he noticed that the number of offspring a male produced varied with the number of females he copulated with, whereas the number of offspring a female produced remained relatively constant regardless of the number of partners she mated with. Bateman argued that because an ovum is costlier to produce than a single sperm cell, a female fly’s reproductive success is limited by her ability to make eggs; a male’s, upon the other hand, is limited by the number of females he inseminates. Robert Trivers (1972) formalized Bateman’s experimental data and linked parental investment to sexual selection. According to Trivers, the sex that provides the most parental investment–usually the female–should be more fastidious (should be the “limiting sex”) and the opposite sex should, ceteris paribus, compete for sexual access to the limiting sex, often evolving elaborate secondary sexual characterstics to attract them, and weapons and musculature to compete against same-sex rivals.

The Standard Paradigm is Born: Symons, Buss, and Schmitt

Trivers’ theoretical contributions laid the groundwork for the creation of what remains, with some complications and some dissenters, the standard paradigm of human mate choice. David Buss and David P. Schmitt (1993), building upon previous empirical data from Buss that was inspired by the theoretical arguments of Donald Symons (1979), produced the most coherent, elegant, and comprehensive theory of human mating to date: Sexual strategies theory (SST). Although their entire framework deserves attention, we will only focus on the aspects of it that are directly germane to our PGSI. According to the SST, there are sex differences in mating behaviors, in signaling behaviors, and in mating choices because there are sex differences in the fitness consequences of each. Specifically, Buss and Schmitt, following Trivers (1972), argue that because women are the more investing sex, they are choosier about sexual partners and more focused on procuring important resources for their offspring. Men, on the other hand, are not limited by parental investment but by the number of fertile partners they can obtain; therefore, they are more likely to pursue a mixture of short-term and long-term mating strategies. From this, it follows that men should be attuned to signals of a woman’s fecundity and parenting skill, and that women should be attuned to signals of a man’s resource procuring and resource investing potentials (wealth, status, reliability).

Female Beauty in the Standard Framework

As noted, mate choice is strongly influenced by perceptions of beauty. Brain scans have shown that beauty triggers reward systems in the brain (Aharon et al., 2001) and other studies have shown that attractive women can strongly influence male behavior (Wilson & Daly, 2004). From a Darwinian perspective, beauty is assumed to signal an underlying trait or series of traits that, on average, enhances the fitness of men (and women) who are sensitive to the signal and are able to mate with attractive women (or men). There are a number of proposals about the exact nature of this signaling system. Some argue, for example, that beauty is a “handicap,” a costly signal that indicates “good” underlying immunocompetence genes (for a review see, Gangestad & Sheyd, 2005; Zahavi, 1975). Others argue that beauty is a direct manifestation of female hormones that are correlated with high fecundity (Johnston, 2005). Finally, others argue that beauty is an outcome of minimized asymmetry, especially fluctuating asymmetry, which results from developmental perturbations and/or poor buffering systems and is therefore indicative of “poor” genes (Van Dongen & Gangestad, 2011). These theories are not mutually exclusive and they share an important similarity: they all argue that beauty is an adaptive signal that is either directly (high fecundity) or indirectly (good genes) related to higher fitness. The table below looks at a few of the traits that evolutionary theorists have argued are related to judgments of attractiveness and their putative signaling functions.

Male Status and Wealth in the Standard Framework

As mentioned above, where as men are expected to be more attuned to and influenced by physical attractiveness, women are expected to be more attuned to and influenced by indicators of status and wealth (Buss, 1994). Research indicates that these theoretical expectations are true. Buss (1989) collected cross-cultural data that showed that women valued cues of resource acquisition more than men. In a sample from Serbia, Todosijevic, Ljubinkovic, and Aranci (2003) found similar results. In a clever experimental study, Townsend and Levy (1990) produced experimental evidence that largely corroborated Buss’s previous self-report data. They had models don different outfits representing different levels of socioeconomic status and had subjects answer a variety questions about them. In the low status condition, men and women wore Burger King outfits; and in the high status condition, men wore blazers and Rolex watches, and women wore silk blouses and Rolex watches. For short term relationships, men cared more about attractiveness than did women (i.e., they were less influenced by the status enhancing or status decreasing clothing). More recent research has focused on the specific signaling behaviors of men, and we will return to this topic below.

SOME PROBLEMS WITH THE PARADIGM

A Fruitful Framework with Some Flaws

Solving many otherwise insoluble puzzles and guiding research in an exciting and fruitful direction, the standard evolutionary paradigm (SEP) of human mating and human mate choice is a wonderful achievement; nevertheless, it is flawed in a number of respects. First, although it does take into account the effects of reputation on attractiveness, it does not emphasize the effects of social information on the mating market (but see Kenrick, Li, & Butner, 2003). And second, despite a number of studies and meta-analyses, relatively weak or moderate (at best) relationships between  beauty and the fitness traits (or consequences) it is supposed to signal have consistently been found (Kalick, Zebrowitz, Langlois, & Johnson, 1998; Rhodes, 2006; Weeden & Sabini, 2005; see Van Dongen & Gangestad for moderate effects). The second point poses serious problems for the SEP because the SEP clearly and unequivocally predicts that perceptions of beauty should be related to the fecundity or good genes of the prospective partner. The first does not refute the standard theory, but indicates that it is incomplete. We address each below.

Social Information

A number of narratives (in novels and films) illustrate a dilemma familiar to most who have been in high school (Milner, 2004): A man or woman is attracted to a kind or beautiful potential mate, but that potential mate is in the wrong social group–perhaps a group with low status, or perhaps a group that is bitterly despised (e.g., Montagues and Capulets). Although many of the films that deal with this subject (at least in the modern Western world) end with both parties transcending surrounding social opinion and falling in love, the real world is rarely so inspirational. This might appear a relatively anomalous circumstance, a rare result of conspiring social circumstances unfamiliar to our hominid ancestors, and therefore not a significant evolutionary force, but the very fact that psychological mechanisms exist that prevent or make such relationships difficult should compel reflection. A person’s mate, putative mate, or sex partner, in other words, can have significant status enhancing or diminishing repercussions, and such repercussions inform the person about with whom he or she should mate. A man walks in a room holding hands with an enthralling woman and, absent any other information, most people are going to assume that he possesses significant social status, and they are going to grant him the respect that such status commands. Conversely, if a man walks into a room with an unattractive mate–or a mate rumored to be sexually promiscuous–people are going to assume that he doesn’t have high status (“why would he be with her if he were socially successful?”) and are going to treat him accordingly.

Minimized as Illustrated by EMT

These behaviors are not entirely inexplicable from the perspective of the SEP; however, they are not easily explained by it, and most researchers working within the SEP framework are content to minimize or ignore the influence of social information on mating choices. To see this, consider one egregious example. In 2000, Martie Haselton and David Buss published an interesting, influential, but seriously flawed article that introduced the principles of error management theory (EMT) and applied them to men’s sexual overperception bias (Abbey, 1982). According to Haselton and Buss, humans should possess decision making adaptations that minimize the costliness of necessary errors. For example, if one is walking in the woods and sees something that resembles a snake, it is better, from a cost/benefit perspective, to err on the side of caution and treat it like it is a snake. Haselton and Buss then note that 1) reading intentions is often difficult because of a paucity of information and that 2) the sexes face different costs associated with intention reading errors. Specifically, men overperceive sexual interest. Haselton and Buss argue that this is because the cost of a false positive (inferring sexual interest that is not there) is less than the cost of a false negative (not seeing sexual interest when it is there): “Ancestral men who tended to falsely infer a prospective mate’s sexual intent…paid the fairly low costs of failed sexual pursuit: perhaps some lost time and wasted courtship effort” (pp. 82-83).

We’ll ignore the subtleties of more recent articles using the principles of EMT, and just point out a few things. These will necessarily be appeals to experience because there are not a lot of good data on the effects of getting rejected on social reputation and status. In a wonderful episode of The Wonder Years, Kevin Arnold (the main character), fearfully and fretfully tries to call a girl he is interested in. He picks up the phone, fidgets, hangs it up. He dials a few numbers and hangs up again. Finally, after many desperate attempts, he calls. We suspect that most high school males have had this experience, and it indicates something important: asking a person out or making a sexual advance must be a potentially dangerous action. If it weren’t, Haselton and Buss’s reasoning would hold and making that phone call should be relatively stress free. If the girl says no, so what? About two minutes of wasted time. In fact, if taken literally, Haselton and Buss’s analysis of the costs of making a false positive would appear to predict that men should be asking out every woman that they meet. Again, why not? A few moments of wasted time for a large potential payoff. We contend that what Haselton and Buss ignore, and what is of paramount importance for the human species, is the effect of social information. Put simply, getting rejected is a serious social blow, one with potentially damaging ramifications. And although the SEP does address issues of reputation from time to time (e.g., Schmitt & Buss, 1996), such ignorance is endemic to the paradigm.

The Problem of Beauty: What Does it Really Signal?

As we noted, there are some serious problems with the standard view of beauty. The chief is that thorough analyses have discovered only a small relationship between beauty and health/fecundity. Van Gonden and Gangestad’s (2011) meta-analysis, for example, found a moderate .3 effect size between developmental instability and health measures (the DI effect size was an estimate; the relation found in the article was between fluctuating asymmetry and health measures, which yielded a .2 effect size). Rhodes (2006), in a review, and Weeden and Sabini (2005), in a meta-analysis, found even smaller effects between attractiveness and standard measure of health/fecundity, prompting Rhodes to argue that attractiveness is more of a filter than a gauge—that is, perceptions of attractiveness “weed” out bad genes, but once a certain threshold is crossed, perceptions no longer relate to genetic quality. Some have argued, consistent with the above data, that beauty is the result of “runaway” selection or receiver (or sensory) bias (Fisher, 1930). According to these theories, beauty is not directly linked to fitness. The sensory bias theory (Ryan, 1990), for example, posits that brains have preexisting sensory biases—men’s brains, for example, might be biased toward youthful appearances—and that the opposite sex often evolves characteristics to exploit such biases. Consider a simple case. Because of the burdens of foraging, males might be biased toward detecting and responding to bright colors; females that evolved bright colors (bright eyes, shiny hair) would trigger the biases and compel men to approach; therefore, ceteris paribus, the alleles that caused the lustrous traits would propagate as would the fondness for them (Fisherian selection).

The problem with sensory bias and runaway models of selection is that the cycles they start are not stable and should be countered (see Fuller, Houle, & Travis, 2005; Gangestad & Sheyd, 2005). Consider the example above again. Suppose men are attracted to women with lustrous features but that those features have no connection to fitness. Many men with the bias would be expending precious time, energy, and resources mating with women that do not enhance their fitness. Meanwhile, other men, the ones who could not compete for highly desired mates, would mate with drab women and have equal success despite less effort. At some point, the gene pool would regress to the middle (not lustrous); one would also expect the high quality men to evolve a counter adaptation to resist the charms of the lustrous women, since those charms would be, as it were, factitious (Chapman, Arnqvist, Bangham, & Rowe, 2003). It is, of course, possible that we are currently in a disequilibrium state and that certain biases are being exploited by women; however, it is not a safe assumption.

Summary of Problem with Beauty

Even if there are methodological and theoretical problems with the results cited above, and even if some of the researchers are too pessimistic about the size of the relationship between beauty and health/fecundity, it is important to take them seriously. It is astonishing how many articles simply assert that there is a clear relationship between a trait and/or traits and some underlying fitness component. There isn’t. Instead, there appears to be a very complicated relationship, often tenuous. We believe that our positional goods and social information (PGSI) theory of human mating can make sense of the above.

THE POSITIONAL GOODS AND SOCIAL INFORMATION THEORY OF MATING

Baumeister and Vohs (2004) suggested that mating behavior could be analyzed like a market. That is, there is a supply and a demand and people behave according to the principles of microeconomics. They suggested that women “sell” sex on the market, assuming the basic Buss framework of mating, and that men purchase it through various forms of investment (in prostitution, this investment is monetary; in sanctioned mating, it might be emotional as well as monetary). The value of the sex increases or decreases based on the supply of sex on the market. However, Baumeister and Vohs ignore the importance of positional goods and social information. A positional good is a good or service that is valued according to the desire ranking of other people in comparison to available substitutes (Hirsch, 1976). For example, an original Cézanne painting does not have an intrinsic value, nor is its value determined solely by supply and demand principles; rather, its value is determined by its status ranking (and, concomitantly, the status it confers its owner). People desire the painting because it augments their status. This is the chief feature of a positional good: it is either directly related to status or enhances status through social information; its value is derived from its ranking in a system of desires because status is itself a positional and relative quality. A Porsche, to take another example, is not worth a hundred thousand dollars because of its functional utility; it is worth a hundred thousand dollars because it enhances the status of the owner. We believe that mates function like positional goods and have similar value functions, but first we want to note that this method of analysis is also congruent with another important modern theoretical innovation: signaling theory.

Relation to Signaling Theory: Positional Goods are Excellent Signals.

Signaling theory is a recent theoretical edifice that has been successfully applied to many facets of animal and human behavior (Miller, 2000). The basic principles are that 1) the traits of organisms vary in quality 2) these traits are not always easily perceivable (e.g., ambition, intelligence, reliability, immunocompetence) 3) they can, however, in principle, be signaled 4) signalers and receivers have potentially conflicting interests, but 4) the possible arms race can be avoided by building in a component of necessary honesty (Bird & Smith, 2005; Zahavi, 1975). Although humans inhabit a complex and abstract signaling space, the basic principles of signaling theory hold. Things like prestige goods (e.g. Rolex, Porsche, Blue Label Scotch) or refined talents, tastes, and knowledge (i.e., “symbolic capital”; Bourdieu, 1977) signal social wealth and social status because they are difficult to purchase or acquire; therefore, they are honest signals. Notice that most prestige goods are also positional goods: that is, they are goods that are valued because of their position in a hierarchy of desires. This means that a theory of positional goods is, in a sense, a theory of signaling. In what follows, we will use terms from both theories, with the understanding that they refer to the same basic principles.

Mates are Positional Goods or Honest Signals: Focusing on Women

The above leads to this following proposal: mates are positional goods and are therefore honest signals of underlying or difficult to assess traits such as social or cultural status. Consider, for example, a particular woman. She has intrinsic qualities that affect the reactions of  men. If she is more attractive than surrounding women, for example, ceteris paribus, she will be more desired than the other woman. And if a man copulates with her or obtains a relationship commitment from her, he will have competed against many other men (implicitly or explicitly) and succeeded. This means that she is an honest signal of his status, his intelligence, his ambition, or any of innumerable other traits that allowed him to obtain what the other men could not. In other words, she confers status (called “status conferring potential” or SCP). How much or how little should be a function of three factors: supply, attractiveness, and desirability. Supply refers to the amount of sex or commitment the woman puts on the market (number of sex partners; how choosy for relationships); attractiveness is the biological quality of appealing to the perceptual system; and desirability is the number of potential suitors the woman commands. According to our model, supply should decrease SCP, while attractiveness and desirability should increase it.

This quickly solves an intriguing puzzle: why do many men prefer women who are not as attractive as other potential (and obtainable mates). For example, Kim Kardashian, although attractive, is not more so than many women on an average college campus and yet she has dated or been romantically linked to many powerful and prestigious men including Reggie Bush, Nick Lachey, Ray Jay, Miles Austin, and Cristiano Ronaldo.  From the perspective of the PGSI, this is exactly what one would expect. Kim Kardashian, although not impeccably beautiful, is a highly visible socialite and reality television star (Keeping Up with the Kardashians is viewed by an estimated 4 plus million individuals) and consequently has a plethora of potential suitors (i.e., her desirability is very high), which means that being romantically linked to her increases or confirms a man’s status. Cleopatra VII of Egypt may well have been the most dramatic example of the power that factors other than intrinsic attractiveness play in mate-choice. While she was portrayed by Hollywood sex symbols Theda Bara and Elizabeth Taylor, her real life appearance left something wanting. The coin portraits of her show a relatively unprepossessing woman with an aquiline nose, prominent chin, and harsh eyes. Nevertheless, she won the hearts of two of the most powerful members of the Roman empire: Julius Caesar and Marc Antony. Even Roman historians recorded her striking appearance, charming voice, and ability to “make herself agreeable to everyone,” and power to “subjugate everyone..” (Cassius Dio, Roman History 42: 34). Thus, it seems her status as the queen of an ancient state, combined with her personality, made her very desirable and increased her SCP in the same way that Kim Kardashian’s visibility (though not, we hope, strapping personality) and attractiveness has been translated into SCP.

Notice that this means that men will also be choosy because status increases or decreases based on the SCP of one’s mate. In other words, the SEP’s analysis of men’s mating decisions is only partially correct. It is almost certainly true that men desire short term mates more than women; but they are not indiscriminate about their mates. In fact, in a mating system with high informational spread (everyone knows about everyone), they should be almost as choosy as women; in a mating system, on the other hand, with less informational spread, they should be relatively indiscriminate. To put it crudely, walking hand in hand across a populated park with an unattractive mate is very much like driving through a crowded town in a rusted and broken down station wagon; and walking hand in hand with an attractive mate is like driving an elegant sports’ car (Vakritzis & Roberts, 2009).

Kim Kardashian and Cleopatra

Positional Goods: What about Men
Although there are good evolutionary reasons to suspect that men are more motivated to display signals of social and cultural status, and therefore to display mates, there are also good reasons to assume that women do not entirely lack such motivation (Geary, 2010). First, romantic partners generally come from the same status group, meaning that women should show off a high status mate because it would potentially allow them access to a larger pool of high status men (Milner, 2004). And second, women should flaunt because it would increase their desirability, which, as we have shown, is an important component of their SCP. If a woman increases her SCP, she can compel more resources from her potential mates, which makes the trade for conferred status an equal exchange (i.e., the woman confers status upon her mate and he gives her resources) (Hakim, 2010).

Potential Solution to the Problem of Beauty

The concept of SCP suggests a straightforward explanation for the relatively small relationship between attractiveness and fitness at levels beyond the threshold. Beauty does increase fitness, but it does so in a complicated, diffused, and socially determined manner. Beauty is not just a signal of underlying health, it is also a signal of prestige and bestows fitness increases to men in the currency of social status (see Henrich & Gil-White, 2001). Men who use considerable time and energy pursuing beautiful women, therefore, are not expending valuable resources foolishly; rather, they are pursuing social status, a resource that has important fitness enhancing effects. And beauty, despite not being tightly tied to biological components of fitness, is not meretricious; it is a positional good and its value is as real as the value of a highly desired plot of beachfront property or a Diamond encrusted Rolex.

Now, consider a possible scenario for the evolution of beauty. Those who argue that beauty exploits preexisting sensory biases might be partially correct. Originally, men were biased toward a few obvious indicators of fertility: youth, femininity, and a waist-to-hip ratio that facilitated parturition. Women “responded” by evolving more and more exaggerated cues. Men found the exaggerated cues more attractive and pursued the women who possessed them. The men that succeeded in mating with the most beautiful women were rewarded, not with their mates’ health and fecundity, but with social status from other men. That social status, in turn, was cashed in to obtain more resources and other sexual opportunities. (A cruel irony here: The attractiveness of a woman actually facilitates her mate’s infidelity!). This gain in fitness stopped the normal cycle of sexually antagonistic coevolution from occurring in humans as it does in many species (Rice, 2000). Women benefit, too, because men invest status in their families and their legitimate offspring. This is often ignored but is vitally important—after all, the difference between being Jackson Jordan, recognized son of Michael Jordan, and Jackson Smith, unrecognized son of Michael Jordan is enormous! Therefore, one would expect that women would compete for high status men and for sanctioned recognition of their children—a drama that was played out time and time again in the Roman Empire, for just one example.

Note: Sexually antagonistic coevolutionary cycle can be broken by conferring status on men who procure attractive women even if the traits are not reliable indicators of underlying quality.

Potential Solution to Social Information: Why Caesar’s Wife Must be Above Suspicion. 
The PGSI also suggests a straight forward explanation to puzzles about human mate choice that are caused by social information. From the perspective of the PGSI, human mate choice is inextricably social. Consider the questions we raised about Haselton and Buss’s EMT of men’s sexual overperception. What Haselton and Buss ignore when they calculate the potential costs of making a false positive error is the spread of social information. Getting rejected by a man or woman can be very costly. Suppose, for example, that a guy in high school, call him John, is deciding whether or not to ask out or make an advance on a woman of moderate SCP. If he is rejected, the reverberations of the rejection might quickly run up and down the webs of his social network. Other men and women would assume certain things about him because of his inability to obtain a relatively modest mate. To put matters crudely, this would be like using a credit card to purchase a modest meal and getting declined in front of a number of relevant peers. From our point of view, it would make sense that men might be biased toward seeking out more information about a potential mate if she smiled at them, or laughed at one of their jokes, but they should be quite cautious about making their desires public. This hypothesis is supported by a common but relatively underappreciated phenomenon: indirect speech (Pinker, 2007). Any man or woman who has successfully navigated a social environment has used indirect speech, has made jokes or comments that contain ambiguous information that could be plausibly denied. The purpose of indirect speech is to attenuate informational asymmetry without exposing one’s own psychological states too clearly. For example, let’s return to John. Suppose he is romantically interested in Rebecca. He is not sure if his feelings are requited, and he does not want to get openly rejected. He might resort to making crude, potentially ironic jokes (“I’ll even take you out to dinner if my favorite team wins,” or “We might have to share my shower to save water”). The purpose of these statements is not to get an honest response, but to reduce uncertainty. For example, if Rebecca responded coldly that John’s jokes were not funny, he could be fairly sure that she was not romantically interested; however, if she responded “well, as long as it saves water,” he might suspect that she was interested and “up the ante” by making a bolder statement or joke.

The PGSI also easily explains why dating outside of one’s own status group is perilous. Even if the potential mate in the low status group is attractive, he or she does not have high SCP (low desirability) and therefore can reduce one’s status. This is excellently illustrated by the treacly but delightful movie A Walk to Remember. In it, a “cool” guy named Landon Carter (Shane West) falls in love with a dorky but attractive girl named Jamie Sullivan (Mandy Moore). His friends denigrate her, and others laugh about the relationship, but because it is an inspirational movie, he remains defiant, even punching one of his friends for mocking her. In the real world, few of us have the integrity to defend a low status mate to others with status, and, perhaps more cruelly, few of us have the status or attractiveness to spare.

Finally, the PGSI explains why Caesar’s wife must remain above suspicion. Although one might argue that Caesar’s wife’s reputation must remain pristine for the very simple reason that Caesar doesn’t want to get cuckolded, the story makes it clear that Caesar was not actually concerned with her fidelity, but rather with her reputation as his wife. In effect, what Caesar showed is that he possessed enough status to simply get a divorce at the mere suggestion of impropriety (compare Caesar’s status here to that of Claudius, whose wife,  Valeria Messalina, reportedly cuckolded him on more than one occasion. See, Tacitus’ Annals and Suetonius’ Twelve Caesars).  Consider an analogy. Suppose a rumor was begun that a man’s Porsche had been cheaply made at a knockoff manufacturer. It might damage his reputation and prestige. But suppose that, upon hearing the rumor, he simply discarded the potentially defective Porsche and bought a brand new one. It would enhance his prestige. Caesar’s wife needed to remain beyond suspicion because Caesar was a high status man in a complicated and treacherous system of status competition. Her rumored affairs were too high a cost for him to pay. Although Caesar is an undeniably attractive and dynamic figure, the world would probably be a better place if more of us could model the characters from inspirational films than the all too human characters in history books and the world around us.

 

References

Abbey, A. (1982). Sex differences in attributions for friendly behavior: Do males misperceive females’ friendliness? Journal of Personality and Social Psychology, 42, 830-838.

Aharon, I., Etcoff, N. L., Ariely, D., Chabris, C. F., O’Conner, E., & Breiter, H. C. (2001). Beautiful faces have variable reward value: fMRI and behavioral evidence. Neuron, 32, 537-551.

Bateman, A. J. (1948). Intra-sexual selection in drosophila. Heredity, 2, 349-368.

Baumeister, R.F., & Vohs, K.D. (2004). Sexual economics: Sex as a female resource for social exchange in heterosexual interactions. Personality and Social Psychology Review, 8, 339-363.

Bird, R.B., & Smith, E.A. (2005). Signaling theory, strategic interaction, and symbolic capital. Current Anthropology, 46, 221-248.

Bourdieu, P. (1977). An outline of theory and practice. New York: Cambridge University Press.

Buss, D. M. (1989a). Sex differences in human mate preferences: Evolutionary hypothesis tested in 37 cultures. Behavioral and Brain Sciences, 12, 1-49.

Buss, D. M. (1994). The evolution of desire: Strategies of human mating. New York: Basic Books.

Buss, D. M., & Schmitt, D. P. (1993). Sexual strategies theory: An evolutionary perspective on human mating. Psychological Review, 100, 204-232.

Chapman, T., Arnqvist, G., Banham, J., & Rowe, L. (2003). Sexual conflict. Trends in Ecology and Evolution, 18, 41-47.

Darwin, C. (1871). The descent of man, and selection in relation to sex. London: John  Murray.

Darwin, C. (1958). On the origin of species by means of natural selection. New York: New American Library. (Original work published 1859)

Fisher, R. A. (1930). The genetical theory of natural selection. Oxford: Clarendon Press.

Fuller, R. C., Houle, D., & Travis, J. (2005) Synthesis: Sensory bias as an explanation for mate preferences. The American Naturalist, 166, 437-446.

Gangestad, S. W., & Sheyd, G. J. (2005). The evolution of human physical attractiveness. Annual Review of Anthropology, 34, 523-548.

Geary, D.C. (2010). Male/female: The evolution of human sex differences (2nd ed.). Washington, DC: American Psychological Association.

Grammar, K., Fink, B., Moller, A. P., & Thornhill, R. (2003). Darwinian aesthetics: Sexual selection and the biology of beauty. Biological Review, 78, 385-407.

Hakim, C. (2010). Erotic capital. European Sociological Review, 26, 499-518.

Haselton, M.G., & Buss, D.M. (2000). Error management theory: A new perspective on biases in cross-sex mind reading. Journal of Personality and Social Psychology, 78, 81-91.

Henrich, J., & Gil-White, F. (2001). The evolution of prestige: Freely conferred deference as a mechanism for enhancing the benefits of cultural transmission. Evolution and Human Behavior, 22, 165–196.

Hirsch, F. (1977). The social limits to growth. London: Routledge.

Johnston, V. S. (2005). Mate choice decisions: the role of facial beauty. Trends in Cognitive Sciences, 10, 9-13.

Kalick, S.M., Zebrowitz, L.A., Langlois, J.H., & Johnson, R.M. (1998). Does human facial attractiveness honestly advertize health? Longitudinal data on an evolutionary question. Psychological Science, 9, 8-13.

Kenrick, D. T., Li, N. P., & Butner, J. (2003). Dynamical evolutionary psychology: Individual  decision  rules and emergent social norms. Psychological Review, 110, 3-28.

Larson, E.J. (2004) Evolution: The remarkable history of a scientific theory. New York: The Modern Library.

Miller, G. F. (2000). The mating mind: How sexual choice shaped the evolution of human nature. New York: Doubleday.

Milner, M., Jr. (2004). Freeks, geeks, and cool kids: American teenagers, schools, and the culture of consumption. New York, NY: Routledge.

Pinker, S. (2007). The evolutionary social psychology of off-record indirect speech acts. Intercultural Pragmatics, 4, 437-461.

Rhodes, G., (2006). The evolutionary psychology of facial beauty. Annual Review of Psychology, 57, 199-226.

Rice, W. (2000). Dangerous Liaisons. Proceedings of the National Academy of Sciences, 97, 12953-12955.

Ryan, M. J. (1990). Sexual selection, sensory systems, and sensory exploitation. Oxford Survey of Evolutionary Biology, 7, 156-195.

Schmitt, D. P., & Buss, D. M. (1996). Strategic self-promotion and competitor derogation: Sex and context effects on the perceived effectiveness of mate attraction tactics. Journal of Personality and Social Psychology, 70, 1185–1204.

Symons, D. (1979). The evolution of human sexuality. New York: Oxford University Press.

Todosijevic, B., Ljubinkovic, S., & Arancic, A. (2003). Mate selection criteria: A trait desirability study of sex differences in Serbia. Evolutionary Psychology, 1, 116-126.

Trivers, R. L. (1972). Parental investment and sexual selection. In B. Campbell (Ed.), Sexual  selection and the descent of man 1871-1971 (pp. 136-179). Chicago: Aldine.

Townsend, J.M., & Levy, G.D. (1990). Effects of potential partners’ costume and physical attractiveness on sexuality and partner selection. Journal of Psychology, 124, 371- 389.

Vakirtzis, A., & Roberts, S.C. (2009). Mate choice copying and mate quality bias: different processes, different species. Behavioral Ecology, 20, 908-911.

Van Dongen, S., & Gangestad, S. W. (2011). Human fluctuating asymmetry in relation to health and quality: A meta-analysis. Evolution and Human Behavior, 32, 380-398.

Weeden, J., & Sabini, J. (2005). Physical attractiveness and health in Western societies: A review. Psychological Bulletin, 131, 635-653.

Wilson, M., & Daly, M. (2004). Do pretty women inspire men to discount the future? Proceedings of the Royal Society of London, 271, S177-S179.

Zahavi, A. (1975). Mate selection—A selection for a handicap. Journal of Theoretical Biology, 53, 205-214.

References from Table 1.

1. Jasienska, G., Lipson, S.F., Ellison, P.T., Thune, I., & Ziomkiewicz, A. (2006). Symmetrical women have higher potential fertility. Evolution and Human Behavior, 27, 390-400.

2. Moller, A. P., & Swaddle, J. P. (1997). Asymmetry, developmental stability, and evolution. Oxford, London: Oxford University Press.

3. Marlowe, F. (1998). The nubility hypothesis: The human breast as an honest signal of residual reproductive value. Human Nature, 9, 263-271.

4. Singh, D. (1995). Female health, attractiveness, and desirability for relationships: Role of breast asymmetry and waist-to-hip ratio. Ethology and Sociobiology, 16, 465-481.

5. Wong, B.J., Karimi, K., Devcic, Z., McLaren, C.E., & Chen, W.P. (2008). Evolving attractive faces using morphing technology and a genetic algorithm: A new approach to   determining ideal facial aesthetics. Laryngoscope, 118, 962–74.

6. Fink, B., & Neave, N. (2005). The biology of facial beauty. International Journal of Cosmetic Science, 27, 317-325.

7. Fink, B., Grammer, K., Thornhill, R. (2001). Human (homo sapiens) facial attractiveness in relation to skin texture and color. Journal of Comparative Psychology, 115, 92-99.

8. Feinberg, D.R., Jones, B.C., DeBruine, L.M., Moore, F.R. Law Smith, M.J., Cornwell, R.E., Tiddeman, B.P., Boothroyd, L.G., & Perrett, D.I. (2005). The voice and face of woman: One ornament that signals quality? Evolution and Human Behavior, 26, 398-408,

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Posted in Adaptation, Evolution and Biology, Evolution and Psychology, Evolution by Natural Selection, Mating and Sexuality, Variation | Tagged , , , , | Leave a comment

Becoming a Lightning Rod for Controversy by Starting an Evolutionary Studies Program in Alabama: Part 1

When I let slip that I got my job when I was still ABD during a recession, people still marvel at the dumb luck (or so my low self-esteem still interprets their obvious stupefaction). Similarly incongruous is that I would seemingly jeopardize that position by starting an Evolutionary Studies minor in a state that outsucks every other state in the Union at teaching evolution & is CHOCK FULL of anti-evolution fundamentalist Christians. Yes, there’s an obvious need, but do you really start out a new job by emphasizing your own naïveté?

YOU might take the low road & sagely focus on publications & grantwriting, but these don’t provide the immediate gratification of mobilizing faculty you don’t know at all across a state flagship research university to develop a whole curriculum for a student demand that doesn’t exist (yet!). Sounds tempting, doesn’t it? In fact, I highly recommend it. Who but a new guy is gonna be dumb enough to take so much service on? What better way to demonstrate your efficiency & make yourself a target for even more work? I know how tempting I’m making this sound, but seriously, starting an EvoS program is a really good idea & I’ll tell you why. I wrote a whole kick-off blog on the “what-we-did” to start our program, but, frankly, the EvoS Consortium, Binghamton, and New Paltz already how perfectly good instruction manuals for this (hell, I bet if you check Howthingswork.com, you could probably get more info than I could provide). But what I didn’t see anywhere is why YOU should try it, what YOU’ll get out of it.

Money, fame, & reproductive success. OK, I’m kidding. It’s an evolution blog. Seems like something I should talk about. Seriously though, in the world of cool academic geekdom types of things, there are benefits: 1) you get to meet everyone at the university you want to meet, 2) you get to hang out with interesting people from around the world without having to get in their face for an autograph, & 3) you get to impress undergraduates with all the names you can drop & not be completely full of shit (but as we know, if you’re name-dropping, you’re at least partly full of shit or you wouldn’t need to bother).

Meeting people around town is an underappreciated opportunity. I had a similar opportunity in grad school when I was paid to retool my department’s website (mind you, I had little to no web design experience, but you take these opportunities where they come & figure things out as you go along). It forced me to contact every faculty member & extract CVs & other actually up-to-date information from them. I got to know them better & they all knew me, & doors opened that would not have otherwise, I am certain. The details would be boring to you, but suffice it to say, they involved otherwise unavailable course opportunities & funding that got me thru the program in record time. Surveying the entire Universityof Alabama course offerings for candidates to include in an Evolutionary Studies curriculum, inviting faculty to contribute to the outline of the minor & take part in the team-taught introductory course, & supplicating myself to department chairs for funding to support the speaker series have all brought me onto the radar of sympathetic scholars across a wide array of disciplines that I would have otherwise not encountered so soon or ever. Sure, it might seem easy to just go up to strangers & be friendly, but academics are generally not renowned for their blessings of social grace, & I am no exception. An agenda is like a “pivot” around which I can function socially & feel human-like.

Yet you don’t even have to go to the trouble of a full-fledged minor to enjoy benefit #2. To be included in the EvoS Consortium, you could simply start a speaker series. Fortunately for me, the University of Alabama already had a speaker series in place, so a precedent existed of high-fallutin’ experts coming to town on purpose to hang out with us. In a former life, I used to interview bands under the auspices of music journalism because I really just wanted to meet them & talk to them about cool stuff. Ironically, these conversations were usually rather stilted & awkward until I turned the recorder off & we just started talking records we liked & not about their “influences” & so on (think Almost Famous without the boyish good looks or the chutzpah). But now, when I see a great talk at a conference or read an eloquent (& accessible, thank you!) book by a visionary in our field, I can email the person & offer someone else’s money for them to come hang out with me for few days. Of course, the life of an assistant professor isn’t all sunshine, puppies, & summers off, & coordinating a speaker itinerary is a great big pain in the ass (as, having no event planning, I inevitably wait until the last minute to actually do the “coordination”), but these are the people who have inspired us to do the things we are doing in life (the evolutionary research & job part, not this blogging crap) & so driving them around in your car & having them ask about your kids & YOUR research is just really neat (aw, shucks).

Finally, impressing students by name-dropping is just totally pathetic, but I, for one, am not above it. Nosiree, Bob. Did I mention I was ABD when they hired me? Have you seen this market? I am so impressed with myself for having a job. It is still a headscratcher. Anything to puff up my feathers & bolster my prestige (more about deception & self-deception in a later blog). And seriously, one time last year I did talk so much about personal conversations I’ve had with these “luminaries” in the field in the course of a class that a student actually said, “It’s so cool that you actually know all these people.” Ha! Well, “know” is a bit of a stretch. But yeah, it’s cool when you’re training students based on your firsthand experience, based on your one-on-one conversations based on something ONLY YOU HAVE BEEN TOLD (&, well, every other guest host wherever they’ve given talks & the guy on the plane they were stuck chatting with for 3 hours…& their neighbor, who doesn’t even know or APPRECIATE that they’re famous in the world of evolutionary cognitive neuroscience or biogenetic structuralism or whatever!). Hell, students can find most of what we teach on Wikipedia, but you can impress them by relating what they haven’t even published yet. I had my first experience of this when I was a curatorial intern & docent at the Lower East Side Tenement Museum in New York City. I would come fresh from the Municipal Archives or the Washington Cemetery in Brooklyn, getting information straight from the archivist or having made connections about the Jewish landsmanshaftn former residents of the building used to belong to (the museum is a former tenement apartment building & the tours are about the real people who used to live there—it’s great, check it out if you haven’t) & share them immediately with visitors to the museum. Few others knew (or until then had cared about) that fact & were able to convey it. It wasn’t in the docent script. That feeling was satisfying & still is. I guess that’s what intellectual property is about. People want to feel they have something special only they can provide & make a living off that. Maintaining such proprietary exclusivity seems like a Sisyphean endeavor to me. I am all for sharing, downloading, whatever (hell, you can download all the music I ever made for free, please!), but if I can get a little dopamine fix by impressing an undergraduate here or there, if I can hang out with the people who made me want to become a professor every few weeks, if I can feel like a BMOC as the “co-director” of something, screw it, I’ll do it.

And you know what? There hasn’t been a lick of controversy. So it’s all gravy (except the extra workload, but that just makes me look “industrious”…or so I say to myself). More on that later…

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I’m Not the Only One!

After thinking for several months that I was the only person with a blog about evolutionary clinical psychology, I’ve come across the excellent blogs of Emily Deans, M.D.

Check them out…there’s Evolutionary Psychiatry at Psychology Today as well as her own personal blog of the same name (i.e., Evolutionary Psychiatry). Hopefully they’ll hold you over til I can get myself together enough to start writing more posts of my own!

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The Evolutionary Importance of Mixed-Age Learning – Lessons from a Church Basement

So in spite of how ridiculous Kramer appeared when he famously beat out the karate competition consisting of a bunch of 7-year olds (Seinfeld allusion – you had to be there …), I’ve joined my daughter Megan (11) and son Andrew (8) in taking Tae Kwon Do lessons in a local church basement – under the tutelage of Steve Murphy – who’s, without question, the real deal.

Megan and Andrew started before I did – so this puts them at “yellow belt” and myself at “beginner” (no belt in sight as far as I can tell!). The kids have been doing it for a few years and have all kinds of advanced forms down. I’m lucky if my front kick makes it 4 inches off the ground (and I’m lucky if it’s done with the correct foot on any given occasion …).

But I joined for several reasons – partly to develop my physical and inner self – and, largely, to simply be with my kids as we all advance on this great journey together.

Steve, a seasoned blackbelt built like a Probowl MVP,  runs the show – and he does it about as well as it can be done – with intense warmups (including upwards of 80 pushups and 30 nasty crunches) followed by practicing basic movements, forms, and then relatively advanced activities – activities that happen to underscore my ignorance strongly. But that’s OK – I don’t mind being in the dark a bit every now and then – it’s humbling in a good way. And it’s sometimes nice to not be the one who’s supposed to know the answer!

Steve naturally follows the “mixed-age learning” method that has typfied Tae Kwon Do for centuries. Peter Gray (1988), a renowned evolutionist at Boston College, has demonstrated that this approach is simply natural given our evolutionary heritage. In all pre-westernized cultures that have been studied, learning and play (which are often indistinguishable) occur in mixed-age settings – with individuals from various ages helping teach individuals from various other ages.

Compare that with our typical kind of education today in westernized societies – in which a student is surrounded, all day and every day, by individuals of his or her same age. For years.

Education doesn’t happen that way in the Amazon jungles – and it nearly certainly didn’t happen that way on the Savanna in Africa during the 99% of time that our species evolved from the common ancestor of humans and chimpanzees.

It is natural for us to learn in mixed-age settings – and there are clear benefits to this style. The younger ones can learn from those only slightly ahead, feeling a higher self of efficacy when trying to master tasks. The folks in the middle have a choice of mentoring younger individuals, clearly developing a sense of mastery while honing skills – or taking on challenging tasks by working with relatively seasoned individuals in the group.

Gray (1988) has found that this kind of “natural” educational system actually has many extraordinary intellectual and social advantages – and it’s nice to see that such systems are not dead in these United States. Care for an awesome full mind/body education that takes place in a safe, supportive mixed-age and mixed-skill context? Let me know and I’ll tell you how to get to the church basement!

Reference:

Gray, P. (2008). The Value of Age-Mixed Play. Education Week,  27, 26-32.

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Urban Angst: Darwinian Theory, the Need for Meaning, and Modern Existential Anxiety

“Ever more people today have the means to live, but no meaning to live for.”

Victor Frankl

Almost every human has, at one moment or another, recoiled from the world and asked a simple but disturbing question: “what is the point of this; what is the meaning of it all?” For some, an obvious and appealing answer is easy to achieve. Meaning is given by an all-powerful deity that created the universe; and, although answers vary, this deity usually intended one purpose or another. It did not, in other words, create the planet for pointless amusement. For others, such an answer is more difficult to discover. Without belief in god, questioners must look for other answers, answers that are often less comforting. In the modern era, an increasingly popular answer is that there simply isn’t a purpose to life. Life is, to borrow from Camus and other existentialist philosophers, meaningless. The universe is purposeless. We inhabit one planet among many; we float aimlessly through vast stretches of space and time; and then, when the end comes, we expire as silently and as meaninglessly as a burned out match. However bold or courageous such a belief may be, it does not seem provide succor to those who suffer; nor does it seems to satisfy an unquiet mind as it contemplates its own inevitable demise.

From an evolutionary perspective, the above presents an intriguing puzzle. What possible evolutionary benefit would a need for meaning confer? Why are some answers to the question, “what is the meaning of life,” more appealing than others? And why has the world for many in advanced, industrial societies, become divested of meaning? To appropriately address these questions, I think meaning needs to be divided into two distinct but partially related concepts: implicit meaning and reflective meaning. Implicit meaning is a feeling based experience of meaning that is not wholly conscious or symbolic; it is, in other words, an unreflective state of the mind, a kind of background mood. For example, participating in a sporting event might feel highly meaningful and highly engaging whether or not one reflectively thinks “this is the meaning of life!” Reflective meaning is a conscious, symbolic cognition that explicitly addresses the question, “what is the meaning of life (generally, “of my life”).” For example, a politically active person might think that her purpose or meaning in life is to actively promote the production of a more equitable society.

Implicit meaning, I think, is straightforwardly connected to fitness-enhancing activities. Experiences that are emotionally fulfilling and meaningful generally promote biological fitness because the human organism has been sculpted by evolution to feel satisfied, happy, engaged, by activities that would have increased fitness in the environment of evolutionary adaptedness (EEA; this holds even if one does not accept a “strong” version of EEA; see Damasio, 1999). So, conversations, social games, dates, sex, eating, achieving status, pondering lush environments, et cetera, are all satisfying activities that provide a sense of implicit meaning. Of course, this is not always true because 1) the modern world has introduced many stimuli that are novel and that, in one way or another, “trick” the brain into believing that they are enhancing fitness, and 2) we have needs and desires that compete against one another and deprivation in one area may cause pursuits that are ultimately deleterious. So, for example, playing Call of Duty 4 for endless hours in perfect solitude may feel exciting and engaging, but it probably does not enhance an individual’s fitness (unless one becomes good enough to impress friends and potential mates alike).

Reflective meaning is more complicated and more puzzling from an evolutionary perspective. Jesse Bering (2003) argues that humans appear to possess a unique “existential domain” of cognitive processing, a domain that is independent of the physical, biological, and social domains. Existential cognition, according to Bering, seeks out meaning or teleological purpose for the narrative self. Searching for teleological purpose is a standard way of dealing with artifacts and often of dealing with natural phenomena. Upon observing a device on our friend’s table that we do not recognize, a typical question is “what is this device for?” We categorize objects based on their purpose or function, ignoring more immediate but less important physical characteristics. Although a watering can is more similar, physically, to a trash bucket than to a glass, it is in classified with the glass because its purpose is to hold water, not trash. A mere change of function can change an object’s classification. A urinal, to take an infamous example, can be turned into a work of art by changing its perceived function (from actual urinal to aesthetic object in art show).  In a similar manner, existential cognition asks “what is the function or purpose of this or that event—or, of my life?” This is almost certainly familiar. We are driving home from work, exhausted, perhaps even a bit despondent, when we spot a spectacular rainbow rising from a line of towering trees. Suddenly, we are cheered and we think—even the most materialistic and cynical of us, if only for a moment—the universe must be telling us something, must be signaling something through the rainbow. In a sense, then, we treat our own lives as we would a character’s in a novel; we assume that there is an omniscient narrator–although not necessarily a god–who is deftly using the universe as a form of symbolic communication, who is intending that objects and events function as signs (including our own lives).  Notice that existential questions are most satisfactorily answered with functional or intentional responses. It is not, for example, satisfying to answer that we saw the rainbow because of a large chain of impersonal causes and effects, even if our mind tells us that that must be the case. Likewise, it is not comforting to believe that we are simply the sum of a certain combination of natural elements, shaped and created by natural selection, and doomed to perish after a series of haphazard events and experiences.

I think Bering is correct. We seem to possess an existential domain of cognitive processing. The next puzzle is why we possess this domain of cognition. Is it adaptive? Or is it a cognitive byproduct, a proclivity that is a result of another functional style of cognition? My suspicion is that it originally developed from other cognitive tendencies—most obviously, our tendency to analyze artifacts in a functional manner—but that it was preserved and shaped by natural selection because it was fitness enhancing. Specifically, I think that it facilitated the development of culture and group cohesion by providing a “need” for meaning that could be fulfilled by the ideological narratives of cultural groups. Alexander (1990), Flinn, Geary, and Ward (2005), and Humphrey (1976), have all argued, in one form or another, that many of the traits that make humans unique are a result of coalitional competition. That is, competition between competing coalitions caused a powerful evolutionary pressure that resulted in our unique cognitive abilities, including symbolic cognition. If true, a clear case can be made that that same pressure would have favored humans who found sacred meaning (and therefore motivation) in existential narratives because such narratives are often (almost always in the EEA) provided by culture; concomitantly, evolution would have favored the creation of such narratives, at first to tap into an already existing propensity of the mind, and later to tap into an actively evolving one, each reinforcing the other. The passionate commitment of a Christian to his or her group members, for example, is profound and it is doubtful that such commitment could be sustained or replicated without an elegant and inspiring existential narrative. (This is, of course, a crude simplification. The evolution of such traits was doubtlessly complicated and determined by many variables. I only aim to forward the variable that I find the most compelling and interesting and to explicate in a simplified, but not entirely erroneous, manner.)

This leads to the last question and should allow an educated attempt at an answer: why do so many humans in industrialized societies, despite hitherto unknown luxuries and comfort, complain of a lack of meaning? According to my speculations, meaning evolved in the context of coalitional competition—it provided (and continues to provide) a web of sacred beliefs that bound individuals together into a functional whole. Although many philosophers and cultural critics have argued that the chief cause of a modern sense of alienation and rootlessness is the destruction of traditional myths, I would argue that this reverses the causality. It is certainly true that traditional religious myths have lost their force, especially for a subset of highly educated Westerners; and it is also true that such myths, as Bering (2003) argues, seem to satisfy the existential domain of cognition better than other “scientific” myths; however, the primary cause of meaninglessness is an erosion of social connections and other meaningful activities that we evolved to need, enjoy, and desire—and this erosion has caused an erosion of meaningful narratives (Putnam, 2000). In other words, as the city and the demands of contemporary life increase loneliness and we strive to find implicit meaning in activities that can only offer ephemeral satisfaction, our general sense of purpose declines. This is not to say that modern society is evil or without benefits; however, it is important to contemplate our evolved propensities and to determine if some of the features of our modern environment are starving our brain of important needs. It may turn out that our need for a grand narrative is doomed to remain thwarted, that we have progressed to a point of intellectual maturity that precludes simple but satisfying answers, but that does not mean that we must suffer from a general sense of meaninglessness. With the right kind of social connections and community directed activities, we can create other narratives that are scientifically sound and existentially fulfilling. Unfortunately, these may never match the grandeur of older myths, and may never comfort the afflicted in quite the same way. If so, that is the price we pay for knowledge. Nevertheless, if my hunch is correct, a life filled with implicit meaning is still a life worth living—and, to this end, Darwinian theory is an invaluable guide.

 

 

References

Alexander, R. D. (1990). How did humans evolve? Reflections on the uniquely unique                   species. Ann Arbor: University of Michigan.

Bering, J. M. (2003). Towards a cognitive theory of existential meaning. New Ideas                       in Psychology, 21, 101-120.

Damasio, A. R. (1999). The feeling of what happens: Body and emotion in the making of             consciousness. New York: Harcourt Brace.

Flinn, M. V., Geary, D. C., & Ward, C. V. (2005). Ecological dominance, social competition,             and coalitionary arms races: Why humans evolved extraordinary intelligence.                         Evolution and Human Behavior, 26, 10-46.

Humphrey, N. K. (1976). The social function of intellect. In P. Bateson & R. Hinde (Eds.),           Growing points in ethology (303-317). Cambridge: Cambridge University Press.

Putnam, R. D. (2000). Bowling alone: The collapse and revival of American community.             New York: Simon and Schuster.

 

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