The really bizarre thing is that people who suffer brain lesions like this can't seem to accept that what they're perceiving is "wrong", like the guy who insisted that his left leg wasn't his any more, to the point that he kept trying to throw it out of his hospital bed.

Anyhow, I've never read it, but we talked a lot in class about the book The Man Who Mistook His Wife for a Hat, which I'm told is a great read on the topic.