I'm always surprised by the hostility to evolutionary psychology (ev psych) from the left (meaning further left than loyal Democrats), because I consider the science extremely supportive of the leftist-anarchist worldview. Since many bloggers cover political issues much better than me, maybe as a lefty-anarchist evolutionary psychologist, my blogging efforts would be well spent debunking some common objections to ev psych and highlighting some findings that should be of great interest to. My first pass will skip the references (I'm feverishly ill, but fired up), but if people comment and want the primary literature I'll be happy to provide it!
First of all, the theory of evolution by natural selection is the unifying principle of biology. Since humans are biological organisms, we are no more exempt from the forces of evolution than any other life form. I actually am kind of uncomfortable calling myself an "evolutionary psychologist" because psychology, being the science of brain and behaviour, must be evolutionary; if a central principle or finding in psychology conflicts with evolutionary theory, something is wrong! Furthermore, evolutionary theory has been wildly successful at predicting and explaining animal behaviour, including human behaviour.
Misconceptions (feel free to suggest other objections for me to try to debunk!):
In a
comment thread over at Jack's place, I encountered a few common misconceptions about ev psych, all of which I'd like to eventually address, respectfully. Among them (these aren't necessarily exact quotes, just my understanding of the objections raised):
1. "Sexual attraction is not scientific."
I think the intended meaning (correct me if I'm wrong) is that sexual attraction isn't a topic that science can attempt to understand. If that's the intended meaning, it is very wrong. We know a great deal about the science of sexual attraction; see my comments in that thread for an intro, and feel free to post questions in the comments.
2. "Ev psych is Lamarkism applied to mind."
Originally I wrote: Nobody (or close to it) takes Larmkian inheritance of acquired characteristic seriously in any field of biology, ev psych included. If you think otherwise, please provide specific references and I'll gladly take a look.
Update: I was a bit hasty with the outright dismissal of inheritance of acquired characteristics, because a lot of work in epigenetics is showing exactly that. Still, I don't know of much, if any, use of Lamarck's theories in ev psych; our models are Darwinian (and modern synthesis).
3. "Ev psych claims that human nature is fixed, which can't possibly be right given the extraordinary variety in human behaviour, culture, and social structure."
Indeed, it cannot possibly be right that human nature is fixed. Learning, conditioning, and plasticity are very important parts of understanding behaviour. I think this misunderstanding comes from a root confusion thinking that "genetically based" means fixed. A better way to think of it is that our genetic structure allows flexibility within a certain range.
One commenter highlighted the common occurrence of cross-species adoption, presumably as a way to argue "evolution could not possibly favor an animal investing so heavily in the offspring of another species?" The confusion here is between proximate and ultimate levels of explanation. Evolution by natural selection creates proximate mechanisms that are adaptive on average. That "on average" is key! In the case of cross-species adoption, the evolved proximate mechanism might be something like "take care of younglings in my nest." Since the vast majority of such younglings would be your own offspring, this behavioural tendency is adaptive on average. But there are many species, cuckoos for example, that exploit parental sollicitude mechanisms as a way to avoid the cost of raising their own offspring.
4. "Ev psych is innately conservative."
The next section mentions some key findings that I think are deeply subversive, but I'd be curious to hear what people think are the conservative aspects of ev psych.
Findings that lefties ought to like:
1. Inequality seems to be at the root of a variety of social ills.
Since natural selection can be conceived of as intrasexual competition for a share of the parentage of the next generation, it follows that inequality of outcome should be associated with heightened competition. Where there is a "winner take all" situation, for example in elephant seals, where one dominant male beachmaster gains the vast majority of sexual access to females and thus a large share of the parentage, we expect fierce competition, which we certainly see. Humans are no different! There is no better predictors of male-male homicide (from a cross-national scale, all the way down to neighborhood level) than income inequality (except possibly life expectancy, which I can address later if someone is curious). A variety of other social ills (e.g. a myriad of health outcomes, problem gambling, traffic fatalities) are also strongly correlated with income inequality. Correlation doesn't equal causation, but the findings are overwhelmingly supportive of the basic concepts of biology, and are equally supportive of the anarchist worldview of skepticism towards power structures! A common confusion is that these issues are related to absolute poverty, as opposed to relative poverty, but these correlations remain extremely strong once you control for various poverty measures (plus poverty is a relative concept anyway).
2. The classical economics model of humans as purely self-interested rational maximizers is totally inadequate.
Cooperation and conflict is my specialty within the field, and there are dozens, if not hundreds, of studies debunking the conservative models common in economics. In fact one group of evolution-minded researchers has proposed that humans are innately cooperative, even in situations where we do not stand to gain ("strong reciprocity" theory); I find the details slightly misguided, but its popularity if nothing else is indicative of how seriously the discipline takes cooperation and altruism as a fundamental characteristic of human psychology.
Ok, that's all for now. I'll update or make new posts if I attract some attention.