I’ve seen a lot of transsexuals talking about how they were born with different brain chemistry. For example a biological male saying he was born with a female brain. I haven’t seen much research on this, but here is an article that examines it, and the conclusion is that there isn’t enough evidence to support the claim that transsexuals are born with a brain that is different in that way. I thought it was an interesting read.
It is called – Are transsexual brains different? – By Neil Whitehead, Ph. D Lower Hutt, New Zealand