I think the existence of zombies would contradict certain laws of nature in our world. It seems to be a law of nature, in our world, that when you get a brain of a certain character you get consciousness going along with it.
David ChalmersConsciousness poses the most baffling problems in the science of the mind. There is nothing that we know more intimately than conscious experience, but there is nothing that is harder to explain.
David ChalmersWhat does it mean, exactly, for a given system to be a "neural correlate of consciousness"?
David Chalmers