Dr. Marc Breedlove

that he could only look at this nucleus in adults, right?

You can only look, it's so tiny.

The sexually dimorphic nucleus, the preoptic area in humans, it's about the size of a grain of sand, right?

So you got to have a microscope and you can only, there's no non-invasive way to look at it.

And he pointed out that he didn't know if, what the order of causation was.

He didn't know if those men had been born with a smaller SDNPOA and that's why they became gay.

Or did something else cause them to become gay and also cause the SDNPOA to get smaller?

And for the public, the idea that a nucleus might change its size in adulthood, maybe that seems kind of unlikely.

But as neuroscientists, we know that adult brains are changing all the time.

In fact, even in animals, Brad Cook showed that there's a nucleus, the medial amygdala,

There's sex difference there, but if you take away the testosterone in males, sex difference goes away in just a matter of a few weeks.

So Simon's work on the SDMPOA, also known as INA3, I won't bother with why.

I waste so many synapses on totally useless crap.

But that's worth holding on to.

You did well.

So we don't know.

it's a chicken and egg problem.

We don't know if that happened, if they were gay because they had a small line of three, or do they have a small line of three because they're gay.

So what I liked about Dennis' otoacoustic emissions is pretty good evidence that that happened well before they had a sexual orientation.

And the other thing I always liked about it is that, well,