a person's inability to recall what happened during a hypnotic trance. Commonly, the involved party is directed to forget the hypnotic experience until receiving a predetermined cue from the hypnotist- at which point, recollection of the experience comes back. That being said, highly vulnerable people might reflect spontaneous posthypnotic amnesia.
POSTHYPNOTIC AMNESIA: "The patient is a prime example of posthypnotic amnesia."