Neuroanthropology

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Archive for the ‘Relationships’ Category

The Gay Brain: On Love and Science

Posted by dlende on June 25, 2008

A lot of controversy and blogging about the gay brain of late. Here’s the Savic and Lindstrom paper that got the fray started, with Mind Hacks’ accompanying coverage on the Return of the Gay Brain.

Shortly afterwards, Vaughan proposed “hard wired” as one of the worst psychobabble terms. For me, the fixation on biological determinism is the larger, and worse, cultural concept behind that. So I propose leaving behind biological claims for identity. It just gives us claptrap like the opening lines from the New Scientist news report, “Brain scans have provided the most compelling evidence yet that being gay or straight is a biologically fixed trait.”

Compelling evidence? While there is interesting work on biology and sexuality (the LA Times covers some of it), there is plenty to doubt about the present work, as the Neurocritic points out quite well here and here. This sort of work represents bad brain science: reported claims overreaching the evidence, an often notable lack of comparative work and appropriate controls, little longitudinal analysis, and on and on.

The worst thing about it? The science, whatever it turns out to be, cannot take us from is to ought.

To add my two anthropological cents, human sexuality is varied. Trying to shoehorn sexuality into one socially and politically charged box just does not work well from an anthropological point of view. As one example, men in some cultures go through different life stages, and in some of those stages homosexuality is the normal way of being, whereas at other times heterosexual relations are the norm. To speak personally, I’ve known people who have had an array of partners in their lives, individually recreating what cultures like the Etoro have shown us ethnographically.

On the neuroplasticity and experience/behavior side, this type of approach generally leaves out something every consenting adult knows. Sex matters! The experience of a sexual encounter helps shape our desires, our pleasures, our associations.

But there is something that matters more to me, and most of the people I know, than sex. LOVE. All this debate about cerebral asymmetries and biological determinism misses the human point. Love matters.

Who cares whether sex between whatever combination of men and women is or is not natural? Love makes a much bigger difference in people’s lives. Love between two committed partners, love of a parent for a child, love of family and friend and groups finding common bond.

Love holds us together, whereas the debates over how gay our brains may or may not be aims to divide us, to heighten identity politics at the expense of those experiences and behaviors whose impact lasts longer. We sacrifice the strength of intimacy to proclaim the supposed facts of science.

There are those who will say that knowing the nature of the problem (how easy to slide from one sense of the problem to another) will help us make better determinations about what to do, that more information will lead to better decisions. Or that being able to claim the mantle of biologically innate will help in the fight against the other side.

I would counter that these sorts of assertions cut entirely against the grain of the society we have built, whether that is a liberal vision of equality before the law or a conservative vision that government should not dictate people’s private choices. But that vision gets sacrificed at the altar of proclamations of moral superiority and the exercise of vindictive power.

Science, with its claims of facts and evidence, steps so easily into that arena, declaring this and that truth. In doing that, the scientists are forgetting what matters, both about science and about human experience.

Posted in Gender, general, Human variation, Philosophy, Politics, Relationships, Sex | 3 Comments »

Parents’ stress, children’s health

Posted by gregdowney on March 19, 2008

Blogging on Peer-Reviewed ResearchTo all the stressed-out parents out there, here, let me just hand you a bit more to worry about. A research team led by Dr. Mary T. Caserta at the University of Rochester (more on her research here) have an article in press at Brain, Behavior, and Immunity entitled, ‘The associations between psychosocial stress and the frequency of illness, and innate and adaptive immune function in children’ (abstract here, unfortunately, I couldn’t find a downloadable version of the whole article). 169 school-aged children and their parents were studied through health diaries and over seven sequential visits, each separated by six months (three years total, by my quick calculation). At these visits, children were tested for human herpesvirus 6 reactivation and general measures of immune function were examined, such as ‘natural killer (NK) cell function and the percentage of CD4 and CD8 cells associated with immune control of cytomegalovirus (CMV).’

The study was to test the relation between parental stress and children’s immune systems:

Family processes have a substantial impact on children’s social and emotional well-being, but little is known about the effects of family stress on children’s physical health. To begin to identify potential links between family stress and health in children, we examined associations between specific aspects of family psychosocial stress and the frequency of illnesses in children, measures of innate and adaptive immune function, and human herpesvirus 6 (HHV-6) reactivation.

The researchers found that parental stress was associated with the illness rates in their children. Although HHV6 activation rates did not increase, the rate of illness in the children (according to the diaries, presumably) and the activation of the children’s immune systems were both elevated. It’s not entirely clear to me from the abstract, so I’ll have to wait for the full write-up to get a sense for the mechanisms involved. The researchers concluded, ‘There is an association between specific psychosocial stress exposure and rates of illness and immune function in normally developing children.’

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Posted in Medical anthropology, Relationships, Stress | 2 Comments »

Headline: Maternal Instinct Is Wired Into The Brain

Posted by dlende on March 7, 2008

Sometimes it’s great to see other people make all those arguments that come to mind when brain imaging research gets turned into instincts and hard wiring.  Tara Parker-Pope runs a blog On Health through The New York Times, and while I have liked some of her previous posts (that’s where I found the autism YouTube video), today she really misses the mark.  And the people commenting really let her know it!

 So here’s the quick summary.  TPP reports on imaging research with 13 mothers and their 16-month-old infants (well, toddlers, wouldn’t they be by then?).  They were then shown videos of their own babies and other babies while images were taken of their brains.  “When a woman saw images of her own child smiling or upset, her brain patterns were markedly different than when she watched the other children. There was a particularly pronounced change in brain activity when a mother was shown images of her child in distress.”

TPP then provides a winner quote from the editor of Biological Psychiatry, which published the piece last month: “This type of knowledge provides the beginnings of a scientific understanding of human maternal behavior”

First comment, from PlainJane: “This does seem to be proving the bleeding obvious… [But] what happens then to mothers who are shown NOT to have these “natural” responses in their brains to their infants? Will they be locked up as freaks or have their kids taken from them? I can just imagine.  Or will neglectful mothers be able to say “oh its biological, I can’t help not bonding with my child”?  I applaud further research into all aspects of the human brain but you and other non-scientist commentators are vital in directing HOW this is viewed. It would be nice for your blog to put it in some more context.’

Katie: “By 16 months mothers and children must be bonded, and of course the mothers would react to seeing their child in distress – for more than a year they have been reacting to their child to meet its needs… And what about moms who adopt? or use surragates?”

Mark: “I would never have suspected that mothers have a special attachment to their own children. What will they find out next?”

Marcus: “The phrasing is misleading and suggests a common but fundamental misrepresentation of what this type of fMRI research shows — or maybe a misunderstanding that confuses a general audience. “Wired,” “hard-wired,” and “instinct” suggests genetically programmed in, like a reflex. A brain pattern that shows up on fMRI studies, however, can reflect brain “programming” that has been acquired through experience, to use the computer metaphor.”

LJB: “I can’t help but feel like this research is going to be used as the crux of some defense lawyer’s argument as to why his client abandoned her child. While I’m sympathetic to post-partum issues (it took me longer than expected to bond with my son after birth) I was still fiercely protective of him and responded to him, although I was terrified of not doing it right when I went to him. I think the mother-infant bond is more complex and this is just one of the many layers of the proverbial onion.”

JiminBoulder: “Will you please stop turning us into machines?”

Jeanne, mother of five: “The absolute hilarity of the line “This type of knowledge provides the beginnings of a scientific understanding of human maternal behavior,” made my day!”

Posted in Brain imaging, Relationships | 1 Comment »

Taking Play Seriously

Posted by dlende on February 19, 2008

When I lived in Nigeria, I used to cross the city of Calabar to visit the defunct zoo, taking food for the animals—a constrictor snake, some crocodiles, a male drill monkey—still trapped in cages.  Jacob, a large juvenile chimpanzee, lived in that zoo in a cage roughly ten feet by ten feet.  As I walked onto the zoo grounds, Jacob would greet me with an exuberant pant-hoot and I would respond back (my Intro to Anthro students are endlessly amused when I demonstrate my pant-hooting skills).  Though I carried food for him, what Jacob most wanted to do was play with me. 

Jacob loved to play tag first, swinging back and forth across the front of his thickly barred cage, sticking a hand out to see if I could catch it.  We would rush back and forth together, Jacob generally favoring the role of being chased.  Then we’d settle down for some tickling.  Believe me, being tickled by a chimpanzee is, I am sure, rather what my boys feel when I get overly excited about tickling them. 

Jacob’s fingers were powerful, and his arms more so, but I made myself laugh in the chortling sound of chimpanzees.  If he got too strong, I could simply let out a sound of pain and he’d stop.  Then we’d get started again, because of course I loved to tickle him back.  I remember times, our heads together, pressed against the bars, his hand at the back of my neck, my fingers digging into his ribs.  It was such fun, yet I never could quite shake the thought in that moment that he could crush my head so easily against the bars. 
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Posted in Animals, Evolution, Learning, Play, Relationships, Skill acquisition, Stress | 1 Comment »

Mimicry and Persuasion

Posted by dlende on February 12, 2008

Greg, I had to put this up for you–mirroring others, salesmen, and the brain?  Couldn’t be a better combination, unless we also stick some no-holds-barred fighting or choke techniques in there when mimicked persuasion fails…

The NY Times has an article today, “You Remind Me of Me,” whose basic point comes to this: “subtle mimicry comes across as a form of flattery, the physical dance of charm itself.”  Subtle mimicry is not immediate and seemingly deliberate, but is a shadowing that happens a couple seconds later.  In one study, supposedly on a new sports drink “Vigor,” some study participants were subtly mimicked in the lab, legs crossed a couple seconds later, body position copied, and so forth.  The result: “None of the copied participants picked up on the mimicry. But by the end of the short interview, they were significantly more likely than the others to consume the new drink, to say they would buy it and to predict its success in the market. In a similar experiment, the psychologists found that this was especially true if the participants knew that the interviewer, the mimic, had a stake in the product’s success.”
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Posted in Learning, Psychological anthropology, Relationships, Skill acquisition | 2 Comments »

The Family Dinner Deconstructed

Posted by dlende on February 8, 2008

National Public Radio had a radio broadcast yesterday morning on “The Family Dinner Deconstructed.”  Here’s the blurb: “The ritual of a family dinner has been praised as an antidote to bad grades and bad habits in kids. But as researchers look closer at the family dinner, they raise the question: Is it the mere act of eating together that counts, or is it that strong families are already more likely to have a family dinner?” 

The reporter does a wonderful job talking with a variety of researcher to focus in on the proximate features of the family dinner—conversations, relationships, rituals, emotions—and how they can impact physical and mental health.  For example, the quality of conversations at mealtime was a better predictor of reading development than parents actually reading to their children.  But what mattered was the content on dinner conservation, that it was complex and “rich with explanation, story telling, and more.”  Similarly, for physical and mental development (for example, eating disorders), specific behaviors at dinner proved important: roles assigned (setting the table, beginning and end to dinner); a genuine concern about daily activities; and a sense of empathy and concern for each other. 

While the radio cast pushes a double-blind study to “determine” the specific effects of a good-quality family dinner versus dinner-as-usual, the announcer rightly acknowledges that doing such research is a daunting prospect.  I would add that an ethnographic approach that builds on this educational and psychological research and that teases out the relationships between dinner, family interaction, and development as a joint physical-mental phenomenon could also add some great insights.

Posted in Developmental psychology, Education, Food & Eating, Human variation, Learning, Relationships | 1 Comment »

Mice brains on stress

Posted by gregdowney on January 21, 2008

Blogging on Peer-Reviewed ResearchIn February 2006, a research team at University of Texas and Tufts University published a piece in Science on how experience could modify the structures in the brain that affect the production of dopamine through brain-derived neurotrophic factor (BDNF) (abstract here). The research team used ‘social defeat’ to explore ‘the neurobiological mechanisms through which psychosocial experience alters the activity of the mesolimbic dopamine pathway’; in other words, the malleable system that can induce structural changes in the brains of mice in response to persistent patterns of social interaction.The abstract, while a little thick, suggests all sorts of intriguing possibilities:

Mice experiencing repeated aggression develop a long-lasting aversion to social contact, which can be normalized by chronic, but not acute, administration of antidepressant. Using viral-mediated, mesolimbic dopamine pathway–specific knockdown of brain-derived neurotrophic factor (BDNF), we showed that BDNF is required for the development of this experience-dependent social aversion. Gene profiling in the nucleus accumbens indicates that local knockdown of BDNF obliterates most of the effects of repeated aggression on gene expression within this circuit, with similar effects being produced by chronic treatment with antidepressant. These results establish an essential role for BDNF in mediating long-term neural and behavioral plasticity in response to aversive social experiences.  

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Posted in Animals, Bibliography, Brain Mechanisms, Emotion, Medical anthropology, Relationships, Stress | Leave a Comment »

Why We Love, The Time Magazine Version

Posted by dlende on January 18, 2008

Too bad Jeffrey Kluger didn’t pay closer attention to Hannibal Lecter.  He might have written a better article on “Why We Love,” out this week in Time Magazine, instead of giving us a flawed view of evolution and brain research.  Still, in furtive glimpses of data, rather than quick quotes and pop theories, another way to think about love glides onto stage. 

As I told my anthropology students yesterday, the initial assumptions we make so often dictate our ideas and our results.  But those assumptions are generally presented as “facts” or assertions of truth, part of an unassailable background.  So here are the ones packed into Kluger’s piece, right there at the beginning: (1) that humans rely on our wits, so “losing our faculties over a matter like sex” needs explaining (in other words, humans are rational, why have primitive passions); (2) that we evolved in a “savanna full of predators,” so getting distracted by love could be potentially dangerous, (3) that our genes have “concerns,” primary among them to make us reproduce as much as possible (“breed now and breed plenty gets that job done”), and (4) that we can extend these sorts of explanations to all “the rituals surrounding” sex, love and relationships (like a bunch of scientists drunk on their own ideas—explanatory expansion gone wild!). 
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Posted in Brain imaging, Emotion, Evolution, Relationships, Uncategorized | 1 Comment »

Loneliness and Health: Experience, Stress, and Genetics

Posted by dlende on January 11, 2008

Blogging on Peer-Reviewed ResearchFeeling lonely?  Well, that might make you sick.  The mechanism?  Well, here’s the surprise.  Patterns of genetic expression.

 Here’s the press release from Genome Biology, “People who experience chronically high levels of loneliness show gene-expression patterns that differ markedly from those of people who don’t feel lonely.”  The study’s lead author, Steven Cole, notes: “In this study, changes in immune cell gene expression were specifically linked to the subjective experience of social distance.  The differences we observed were independent of other known risk factors for inflammation, such as health status, age, weight, and medication use. The changes were even independent of the objective size of a person’s social network. What counts, at the level of gene expression, is not how many people you know, it’s how many you feel really close to over time.”    Read the rest of this entry »

Posted in Embodiment, Emotion, Medical anthropology, Psychological anthropology, Relationships, Stress | 4 Comments »

‘How Your Mood Affects Your Health’

Posted by gregdowney on December 20, 2007

One of my preferred news compilation websites, Alternet.org, just published a piece, originally from the UK Independent (I believe), on the relation of emotions, personal interactions, and similar ‘moods’ on health. Anastasia Stephens, in the article, ‘How Your Mood Affects Your Health,’ runs through in very cursory fashion a whole host of research on the effects of things like laughing, stress, arguments, and crying on the human immune systems, healing, and the like.

The article has a lot of fun little research summaries, unfortunately, without links to the actual research reports or anything deeper about the studies. But there’s warnings about how arguing affects healing:

A half-hour argument with your lover can also slow your body’s ability to heal by at least a day. In couples who regularly argue, that healing time is doubled again. Researchers at Ohio State University discovered this by testing married couples with a suction device that created tiny blisters on their arm. When couples were then asked to talk about an area of disagreement that provoked strong emotions, the wounds took around 40 per cent longer to heal. This response, say researchers, was caused by a surge in cytokines — immune-molecules that trigger inflammation. Chronic high levels of these are linked to arthritis, diabetes, heart-disease and cancer.

Or another personal favorite:

Scientists at the University of California have discovered that laughter relaxes tense muscles, reduces production of stress-causing hormones, lowers blood pressure, and helps increase oxygen absorption in the blood. Cardiologists at the University of Maryland Medical Center found laughing can actually reduce the risk of heart attack by curbing unwanted stress, which can destroy the protective lining of blood vessels. A good giggle also burns calories since it’s possible to move 400 muscles of the body when laughing. Some researchers estimate that laughing 100 times offers an aerobic workout equivalent to 10 minutes on a rowing machine or 15 minutes on an exercise bike.

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Posted in Embodiment, Emotion, Medical anthropology, Neural plasticity, Relationships | 5 Comments »

 
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