Sex on the brain

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That's the title of the cover story (by Hannah Hoag) in the most recent New Scientist (19 July 2008). It begins:

ANYONE in a long-term relationship will tell you that, at times, men are indeed from Mars, and women are almost certainly from Venus. It's common knowledge that the sexes often think very differently, but until recently these differences were explained by the action of adult sex hormones or by social pressures which encouraged males and females to behave in a certain way. For the most part, the basic architecture of the brain, and its fundamental workings, were thought to be the same for both sexes.

Increasingly, though, those assumptions are being challenged. Research is revealing that male and female brains are built from markedly different genetic blueprints, which create numerous anatomical differences. There are also differences in the circuitry that wires them up and the chemicals that transmit messages between neurons. All this is pointing towards the conclusion that there is not just one kind of human brain, but two.

Oh, spit! Here we go again, with reports of previous studies of anatomical and neurological differences (critiqued in a long series of postings here) interpreted as establishing categorical differences between the sexes and so echoing "common knowledge" in a crude way. I haven't the heart to reflect on yet another chapter in this story.



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