A better understanding of the brain is certain to lead man to a richer comprehension both of himself, of his fellow man, and of society, and in fact of the whole world with its problems.

I can state with complete assurance that for each of us our brains form the material basis of our experiences and memories, our imaginations, our dreams.

In order that a self may exist there must be some continuity of mental experiences and, particularly, continuity bridging gaps of unconsciousness. For example, the continuity of our self is resumed after sleep, anaesthesia, and the temporary amnesias of concussion and convulsions.