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Post-hypnotic suggestion is the induction, under hypnosis, of a person into a behaviour or thinking pattern that makes itself manifest after he has come out of the hypnotic state.
Post-hypnotic suggestions are set by a hypnotist and may optionally include a time scope. An altered sense of perception or behavioural pattern may be "programmed" into the person under hypnosis.
Certain sequences of events may be set as triggers to enter or exit the post-hypnotic pattern. The behaviour patterns resemble conditioned reflexes, though administered without classical behaviour alteration techniques.