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The effect of posthypnotic amnesia suggestion on retroactive interference with hypnotically naive subjects.
Posthypnotic amnesia has long been considered an essential characteristic of hypnosis. It was first reported by the Mar- quis de Puysegur in 1784 while experimenting with his famous subject, Victor. Since it was well known that sleepwalkers experienced amnesias, the phenomenon was called artificial or induced somnambulism. Liebeault (1866) included spontaneous posthypnotic amnesia as one of the signs of the deepest levels of hypnosis. Since that time, and until Hull's book in 1933, most writers on hypnotism believed that posthypnotic amnesia was the single most significant sign of deep hypnosis.