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The British Medical Association and the American Medical Association has called it "a temporary condition of altered attention in the subject that may be induced by another person," (Compton's Multimedia Encyclopedia) but there is still much about that is not und ....

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.... cause them any pain. The heartbeat can be slowed or quickened, and a rise in temperature and perspiration can be created. They can be commanded to experience visual or auditory hallucinations or live the past as if it were the present. Also, recently a scientist discovered that the way the subject's mind experiences time can be altered so that hours or even weeks can pass in second, from the subjects point of view. Subjects may forget part or all of the hypnotic experience or recall things that they had forgotten. The hypnotist may also make "posthypnotic suggestions" that are instructions to the subject to respond to a something after awakening. ....