I couldn't resist clicking on this link when I was scanning the headlines in Yahoo News. The study was conducted at Yale and involved tests on brain cells in the lab.
"Too little testosterone is bad, too much is bad but the right amount is perfect," said Barbara Ehrlich of Yale University in Connecticut, who led the study.
Um, duh. How banal is that comment?
Anyway, to prove that they weren't being sexist or anything, the researchers did similar tests on estrogen and discovered that "estrogen is neuroprotective. If anything, there is less cell death in the presence of estrogen."
Hmm. Interesting that even at the hormonal level, the stereotype of women as more nurturing and caring than men holds.