Brain-culture, memes, and choosing examples

Earlier today, I wrote a post on Bruce Wexler’s book where I suggested that ideology and ‘culture shock’ were not necessarily the best case studies to work with when discussing the integration of social theory with neurosciences. My reasons for this are many, but they boil down to a fear that, if we choose our case studies poorly, we will not offer compelling integrated accounts that bring together biological studies of the brain and humanistic studies of society and culture. It may have seemed that I was not overly generous to Wexler, however, even though I quite like his work, so I thought I’d balance this out by giving some examples of ways that anthropologists have similarly chosen examples that make it especially difficult to present coherent accounts across different scales and perspectives on a subject.

One of the best/worst examples of attempting to prematurely bridge the gap between culture and brain science is the concept of ‘memes.’ First proposed by Richard Dawkins in 1976 (in The Selfish Gene), a ‘meme’ is defined by Dawkins as the smallest unit of cultural information, which spreads from one person to the next through diffusion, sort of like an infection. Dawkins and other ‘memeticists’ (is that a word… or a meme?) are at pains to argue that culture propogates itself, like a catchy tune you can’t get out of your head or a fashion you must have that you then make your friends crazy to imitate, because of the effectiveness of the meme, not because it is useful to the bearers. Proponents also argue that, although there are significant differences with genes, evolutionary theory can also be applied to memes to understand how cultural ideas spread, develop, change, or become extinct.

So what’s the problem with memes?
Continue reading “Brain-culture, memes, and choosing examples”

Cellular effects of exercise

I just came across a news report on the Times Online website by Nigel Hawkes, entitled, Exercise really can make you younger, study shows. A team from King’s College London looked at telomeres, a section of repeating DNA at the end of chromosomes, in twins to judge how exercise affected them. Telomeres protect the end of chromosomes, and they shorten over our lives (however, long telomeres may increase the likelihood of cancer, so there’s a trade-off between cancer susceptibility and aging). A study in 2002 even showed that telomere length could be used in forensic anthropology to tell the age of remains. The researchers used questionnaires, but they also looked at data from twin studies, to try to isolate the effects of exercise, controlling for BMI, smoking, diet, and even genetic inheritance (hence, the twins).

The difference could be pretty significant. Dr Lynn Cherkas from King’s College explained: ‘Overall, the difference in telomere length between the most active subjects and the inactive subjects corresponds to around nine years of ageing.’ According to the researchers, their results ‘show that adults who partake in regular physical activity are biologically younger than sedentary individuals.

‘The only reason I point out the research on the Neuroanthropology blog is that here we have another cellular-level mechanism that profoundly affects very basic body functioning that can be manipulated by individuals, behaviour, cultural ideals, social fads, and even moral panics. The amount of exercise we get affects the speed at which our cells age; but the amount of exercise we get is, in turn, affected by a whole range of things, from changing policy and budget concerns at schools, to safety concerns about transportation, housing patterns, leisure activities, public health campaigns… In other words, we have a wonderful example in the current discussion of exercise, and the effects of exercise on our telomeres, of a way that sociological-scale phenomena might affect very microscopic-scale qualities of the human body. The shape of our DNA is not just a cause of our physiology, but also an effect of our physical activity.

Welcome to new readers: Why brain science needs anthropology

Blogging on Peer-Reviewed ResearchAfter a couple of really welcome links at places like Mind Hacks (from Vaughn) and at Dr. X’s Free Associations, as well as references from our friend Prof. Sue Sheridan at Life of Wiley (Home of the Daily Skeleton Action Figure), we at Neuroanthropology find ourselves with a lot more visitors over the past few days. Thanks to all of you who are checking us out for the first time and please consider yourself welcome at any time! As a way of welcoming our new readers, I want to reflect on what anthropology is, in my opinion, and why brain science needs it (a later post will discuss why anthropology needs the brain sciences, especially right now in the field’s development).

I was working on this piece before I saw Daniel’s most recent post, but I think it’s a good idea, especially considering the attention we’re getting from the neurosciences blogosphere.  Ironically, we’re probably getting more attention from brain scientists than from anthropologists.  The reasons for this seem to me to be complex, both a sense in the brain sciences of curiosity for things like ‘neuroanthropology,’ or ways of dealing with developmental, social, cultural, ecological, and evolutionary factors in the emergence of the human brain, but also an avoidance trend in cultural anthropology of dealing with psychology, neurology, and biology.  As I’ve discussed elsewhere, fears of ‘reductionism’ in biology in brain sciences and human biology among anthropologists seem to me to be exaggerated, mostly based upon the popularizers of brain sciences (like Pinker, who we’ve taken to task, but others as well) rather than on the more careful and interesting scientists working on the brain (we’ve discussed many examples in previous posts).

Continue reading “Welcome to new readers: Why brain science needs anthropology”