Jackson’s knowledge argument shows that there are certain facts that physicalism does not explain. To enhance this argument, Jackson uses a thought experiment. He proposes the example of a black and white room, and someone named Mary living in it. He says that although, she knew previous facts of colour, she still learns something that she had not known before, which was what red looks like. Mary comes to know the subjective character if red. In response to the example of Mary, Raffman speaks of a philosophical zombie. A philosophical zombie is a being that is physically or functionally identical to humans. Raffman uses the idea of a philospical zombie to criticize Jackson’s thought experiment. She approaches this thought experiment by explaining
