-Introverts have busier brains, bubbling with activity. This is why introverts require less external activity than extraverts do, and excessive external activity becomes exhausting and overwhelming eventually for the introvert, who was already brimming with internal stimulation.
-Introverts' and extraverts' blood flows in different paths through the brain. Introverts have a greater amount of blood flow in the brain, but it moves in longer and slower paths than those of the extravert. The blood also flows to different sections; for the introvert it flows mainly to the sections that are focused on internal things, whereas for the extravert the blood flows to areas used for processing sensory experiences and data (thus external things).
-The chemical balances are also different.
All of this is taken from the book "Introverts in the Church: Finding Our Place in an Extraverted Culture" by Adam S. McHugh. And it's all information that he got from a journal article called "Cerebral Blood Flow and Personality: A Positron Emission Tomography Study", from the American Journal of Psychiatry #156, February 1999, pp. 252-257.
I recommend the book and would love to get my hands on this particular journal article. But then, I don't have access to it. But then again, I know some psych majors. Hmm...
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