Patrick Jane is actually psychic, but either he doesn't realize it, or the more interesting option: he's managed to convince himself that he isn't (possibly repressing knowledge of his true powers after his wife and daughter were killed because of them).  He's still using the powers, but he doesn't realize that he is, and he always has an answer about how he knows the things he knows (because he does know how to do it powerlessly), until one day...he doesn't, and he's forced to confront that knowledge.