The Role of Hormones in the Brain

Male and females diverge in the Y chromosome, which has a gene called the S.R.Y gene. This gene causes the production of testosterone in males and also this other hormone called the malaria inductory factor. Both of those then cause a long pattern of development that causes boys to diverge from girls. And I think the reason that it's difficult to tell how, how it acts on the brain is that many of these changes use the same hormones.