
Yes it’s yet more science bits about brains again, as The Guardian reports that gay men and heterosexual women have similarly shaped brains. Is this sounding familiar at all? Now how the Grauniad latched onto this one before the Male is a bit of a mystery - we can only assume The Male was filled with important news about whether members of Girls Aloud are too thin, or slimming pants or some such like. You’d hardly believe the Grauniad runs a column called Bad Science sometimes.
No what the Grauniad are on about is research at the Stockholm Brain Institute as published in the Proceedings of the National Academy of Sciences. The abstract reads as follows:
Cerebral responses to putative pheromones and objects of sexual attraction were recently found to differ between homo- and heterosexual subjects. Although this observation may merely mirror perceptional differences, it raises the intriguing question as to whether certain sexually dimorphic features in the brain may differ between individuals of the same sex but different sexual orientation. We addressed this issue by studying hemispheric asymmetry and functional connectivity, two parameters that in previous publications have shown specific sex differences. Ninety subjects [25 heterosexual men (HeM) and women (HeW), and 20 homosexual men (HoM) and women (HoW)] were investigated with magnetic resonance volumetry of cerebral and cerebellar hemispheres. Fifty of them also participated in PET measurements of cerebral blood flow, used for analyses of functional connections from the right and left amygdalae. HeM and HoW showed a rightward cerebral asymmetry, whereas volumes of the cerebral hemispheres were symmetrical in HoM and HeW. No cerebellar asymmetries were found. Homosexual subjects also showed sex-atypical amygdala connections. In HoM, as in HeW, the connections were more widespread from the left amygdala; in HoW and HeM, on the other hand, from the right amygdala. Furthermore, in HoM and HeW the connections were primarily displayed with the contralateral amygdala and the anterior cingulate, in HeM and HoW with the caudate, putamen, and the prefrontal cortex. The present study shows sex-atypical cerebral asymmetry and functional connections in homosexual subjects. The results cannot be primarily ascribed to learned effects, and they suggest a linkage to neurobiological entities.
You have to pay to read the whole thing, so relying on the Grauniad summary to translate, what this apparently showed is this:
Savic and her colleague Per Linström took MRI brain scans of 90 volunteers who were divided into four groups of similar ages according to whether they were male, female, heterosexual or homosexual. The scans showed the right side of the brain in heterosexual men was typically 2% larger than the left. Lesbians showed a similar asymmetry, with the right hand side of the brain 1% larger than the left.
Scans on homosexual men and heterosexual women revealed both sides of the brain were the same size.
Now leaving aside all the obvious questions and problems with this - that are nevertheless posed here by some equally sceptical Grauniad readers. I would love to know how the Grauniad uses this research on a relatively small sample of 90 people (25 self defined straight men, 25 self defined straight women, 20 self defined gay men, 20 self defined lesbians) performed once, to draw the following conclusion:
The results could explain a University of London study earlier this year that found gay men and straight women share a poor sense of direction compared with heterosexual men, and were more likely to navigate using landmarks alone.
Or maybe it couldn’t - it is a very small difference, found in an experiment that hasn’t been repeated, once. And that’s meant to explain gender and sexuality based differences in behaviour is it? Particularly since every heterosexual woman I asked in a totally unscientific study at lunchtime at work claimed to be excellent at map reading. Could this difference maybe be learned behaviour? I mean gay men don’t emerge from the womb camper than a row of tents do they, but I’ve still met a few who are in my time. Just as the young would be lesbian doesn’t pop out with a mullet and boy fit jeans and an obsession with Pink (the singer, not the colour). How about this study for instance also reported in the Guardian:
A report from the American Psychological Association shows how sexualisation harms girls - and it’s getting worse, more of it and more extreme. One study showed how anxiety about appearance harms brain function: girls were asked to try on a swimsuit or a sweater in a private dressing room, supposedly to give their opinion. While waiting they were asked to do a maths test. The girls given swimsuits did much worse than those in sweaters, as thinking about their bodies, mostly negatively, undermined their intellectual self-confidence.
Or this one which showed that girls in more gender equal societies are better at maths.
For decades, researchers and educators have debated why boys tend to perform better than girls in math. Are men naturally more logical creatures and thus better at scientific endeavors? Are girls not encouraged by their families, their friends or society at large to pursue scientific careers?
Researchers believe they may have found at least one answer: where girls live. Girls living in countries where there is more gender equality perform better in math, sometimes outpacing boys, than girls who live in countries with more male-dominated societies.
No, Grauniad, what the study shows, is that in the sample of 90 people studied, there was a very small overall, average difference in the size of parts of the brain between (self defined) heterosexual people and (self defined) homosexual people- I always wonder where all the (self defined) bisexuals are in these experiments. Or indeed the (self defined) asexuals or would they just muddy the waters horribly? Now I’m not enough of a statistician to tell you how significant, or otherwise the results were, even in terms of brain size, but even if they do establish beyond a reasonable doubt that yup(self defined) gays have (on average) very slightly different brains from (self defined) straights (on average), that is all they have proved. Nothing else.
So yet again. Why are Swedish scientists so keen to prove this? What are we going to do with the information if it is proved? It seems the most pointless endeavour on the face of the planet. It’s not going to cure cancer, or feed the starving, or make a better mousetrap. “we are gay because we are, that’s all anyone needs to know. “