We still don't understand the influence of the mind's power over the body, no r do we understand why there should be such power. All we can say for certain is that the mind does have power over the body in very many different ways. 

If a man is told that he is at the North Pole and he believes what he is told, he'll show physical signs which suggest that his body is reacting as though he were at the North Pole. He'll go pale and shiver with cold. When the film Lawrence of Arabia was shown, cinema managers around the world reported that the sales of ice cream rocketed. The endless desert scenes had made the moviegoers feel uncomfortably hot.

Hypnotists(催眠师) use the power of the mind over the body in order to use their influence. The hypnotist must only make the patient believe that something is true, and the patient will act accordingly. For example, if he convinces the patient that his arms are as heavy as lead(铅), then the patient will be unable to li ft his arms; if he convinces the patient that a piece of ice is a hot iron and he then touches the patient's skin with the ice, a blister(水泡) will develop. The body will react to the suggestion and not to the reality, and signs of a real burn will appear.