posthypnotic amnesia

This “posthypnotic amnesia” can result either spontaneously from deep hypnosis or from a suggestion by the hypnotist while the subject is in a trance state. The amnesia may include all the events of the trance state or only selected items, or it may be manifested in…

…normal individuals by means of suggestion under hypnosis; and, second, amnesias that arise spontaneously in reaction to acute conflict or stress. Such amnesias are reversible and have been explained wholly in psychological terms. Nevertheless, organic factors are not infrequently involved to some extent, and the distinction between organic and psychogenic…

Posthypnotic amnesia, the forgetting of most or all events that occur while under hypnosis in response to a suggestion by the hypnotist, has long been regarded as a sign of deep hypnosis.