What definition of I and E do you find most useful?

[xNFJiminy]

Originally Posted by Matt22

I strongly suspect that there is something wrong with that theory because "natural brain activity" is too vague and general a description. What would make more sense to me would be if I heard that "Extroverts have less brain activity in ____ part of the brain."

There are different parts of the brain activated, but there is also a higher total amount of neural stimulation. I don't remember if the parts of the brain in which there were differences showed consistent differences or if they were named, so the general finding is the only one I'll state with some confidence.