How does the brain work?

   Most parts of the brain have been given names, and we have some idea about their function. But we do not know exactly how the brain works - how it 'sees', 'hears' and so on, and naming its parts does not help us. It is rather like looking at the outside of a telephone and naming the dial, the receiver, the mouthpiece and so on. This tells us nothing at all of the complex wiring system inside, which actually makes the telephone work.
   In recent years very complicated machines called computers have been built that act in complex ways resembling the activity of brains. They are electronic machines that can carry out calculations very quickly and can store information. But they cannot match the 'thinking' power of the human brain. At the moment it is estimated that a computer that could do every-thing a man's brain can do would be the size of the Empire State Building.