I quoted Jonathan Rauch (on Tokyo) in the last long post. In 2003, he wrote a piece on introverts in The Atlantic (The Atlantic Monthly as it was) which has received more hits on its site than anything they have published. 2006 follow-up. It needed an American to define introversion as an identity or, literally, orientation. Introverts are, he says, not morose. They are neither misanthropic nor shy.
Cavafy virtually addressed a poem to them.