I read part of a book called Mind Wide Open by Steven Johnson, its basically a book about the brain and how it works, but its written in terms that other people besides shrinks and brain surgeons can understand. It has a little bit to say about autism. Apparently the human brain is preprogrammed to use facial features to get an idea of what is going on in the other persons' mind, kind of like mindreading without the ESP element. Autistic people are "mindblind" - their brains are incapable of performing mindreading as a subconcious process like NT's, so they do it as a conscious process, which takes up some of their focus. Think of a normal persons brain as a computer with a network port that automatically sends and recieves data; whereas an autistic person's brain also has a network port, but the computer's user has to manually "point and click" data to send and recieve. Anyways, I didn't read much, but it seems interesting.
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