Dr. Marc Breedlove

So I don't really have anything to say about them.

The one thing I will say is I'm sure that even among lesbians, there's more than one pathway, more than one developmental pathway to become a lesbian or to become a gay man, right?

I don't think there's just one thing.

That's not how human behavior works.

Based on that data, I think testosterone has a say, right?

That doesn't mean it's the whole package.

Prenatal testosterone.

Prenatal testosterone.

Yes.

Yeah, I mean, the way to really bring that home is to compare human brain growth and chimpanzee brain growth.

So up until birth, the rate at which the brain size increases compared to body size is about the same in humans and chimps.

And shortly after birth, the chimpanzee brain stops growing as fast and eventually asymptotes right away.

The human brain continues that feverish fetal rate of growth until at least six years of age, maybe out there to 10 years of age.

So people have pointed out that in a real sense, human beings,

Children are fetuses that are outside learning a whole bunch of stuff from other people.

That's the real distinctiveness of our species is, you know, we have this protracted childhood and really intense social learning.

And as you say, a fetal rate of growth, even though we're not in the fetus anymore.

What's great about studying hormones and behavior, right, is that sometimes you can control the hormone, in animals at least.

But the hard thing about hormones and behavior that people don't understand is that behavior can affect hormones, as you say.

In competitions, the winners afterwards are more likely to have higher testosterone and the losers will have lower.