Questions about the nature of consciousness are closely tied to questions about the nature of the self, because it seems as if someone experiencing it is needed to bring about experiences. There are two ideas about the self in psychology: (1) there is such a thing as a self that has all kinds of experiences and decisions, and (2) it seems as if there is a self, but in reality this is not the case. From the first vision the egotheories arise and from the second vision the bundling theories originated. In people with a multiple personality, it seems that several selves live in them. The most famous example of a person with multiple personality disorder is described by Prince who treated Mrs. Beauchamp. Prince was clearly a supporter of the ego-theories. He believed not only in the 'true Mrs. Beauchamp', but also in various other different selves who were different states of consciousness with a separate will. Around 1960, operations were performed in which the passage(s) between both hemispheres was cut to reduce symptoms of epilepsy. A person in whom this operation was performed is called a 'split brain patient'. Gazzaniga initially believed that there is a 'double conscious system' in split brain patients. So there would be two different forms of consciousness among these people. MacKay believes, however, that there is no evidence for this assumption. He distinguished between executive and supervising parts of the brain. Supporters of the bundle theory argue that the discussion of split brain patients has one consciousness or two is unnecessary, because according to them there is no 'separate' self. Central to James' theory about consciousness and self is the continuity and unity of the self. James sees continuity of the self only as a potential: the thought as a temporary administrator of other thoughts. He...