ABSTRACT
A person who has been deeply hypnotized is able to experience a wide variety of alterations in cognitive functioning in accordance with suggestions given by the hypnotist. The phenomena include subjectively compelling positive and negative hallucinations in all modalities, age regression and other changes in personality, and, perhaps, enhanced memory for past experiences (for comprehensive reviews of research on hypnosis, see Bowers, 1976; Evans, 1968; Hilgard, 1965a, 1965b, 1975, 1977; Orne, 1966a). After hypnosis has been terminated, moreover, the subject often awakens to find himself unable to remember the events and experiences that transpired while he was hypnotized. This difficulty in remembering, known as posthypnotic amnesia, is one of the hallmarks of the experience of hypnosis (for review see Cooper, 1972; Hilgard, 1966; Orne, 1966b).
