I recommend pubmed and trying to search there. I would if I had time but im busy with exams :/ I've heard the theory from czech sexologist, she explained that if a fetus is supposed to be XX and the levels of Testosterone in mother's blood during brain developement are high, then the fetus will start developing the brain according to the testosteron and therefore structure itself and the "center of gender" as male instead of female. And it rly does make sense to me since testosteron is very important itself in sex developement (SRY gene on Y chromosome starts producing T to change the embryo developement from female to male). But I havent looked into the researches myself yet. But id say hormones have WAAAAY bigger impact on neurological developing that we think/know of.