Prenatal testosterone exposure significantly impacts brain development, whereas in adulthood, testosterone acts more as a non-signal with limited influence.

“So, yeah, at the fetal end, when you're still building everything, testosterone and the amount of that is making a huge difference. By the time you're an adult, it's just somewhat of an old and a non-signal.”

“all the evidence shows that testosterone is a potent regulator of neural development and differentiation from females, which is why boys and girls aren't the same.”