Have you read about the experiments done on patients after the split-brain surgery? Basically, they'd show something to the right half of the brain, and when that side of the body reacted to it the left would have to figure out what the hell that reaction was all about. It would make up a reason, though, and the patient would believe that it was the real reason, and not a made-up one.

If you haven't heard about it, though, I've just confused you terribly. I'm sorry.