"Testosterone is a hormone that males produce in far greater quantity than females. It begins production while the individual is still in the womb, and effects brain development."
Obviously-- the word he wants here is "affects". ;)
Obviously-- the word he wants here is "affects". ;)
Yes, you are right. It seems unlikely that testosterone alone is responsible for brain development in general. On the other hand, the person doing this research is saying that testosterone effects a particular type of behaviour, not simply affecting it but producing it. As the article says, "Criminal and high-level intellectual activity have the same underlying motor according to Kanazawa: testosterone."