Hypnosis is a social interaction in which one person responds to suggestions given by another person (the hypnotist) for imaginative experiences involving changes in perception, memory. A typical hypnosis session begins with an induction procedure in which the person is asked to focus his or her eyes on a fixation point, relax, and concentrate on the voice of the hypnotist. Although suggestions for relaxation are generally part of the hypnotic induction procedure, people can respond positively to hypnotic suggestions while engaged in vigorous physical activity. The hypnotist then gives suggestions for further relaxation, focused attention, and eye closure. After the person’s eyes are closed, further suggestions for various imaginative experiences are given. For example, individuals might be asked to extend their arms and imagine a heavy object pushing their hands and arms down or to hear a voice asking questions over a loudspeaker. Or, the hypnotist might suggest that when they open their eyes, they would not be able to see some object that has been placed in front of them. Posthypnotic suggestions may also be given for responses to occur after hypnosis has been terminated, including posthypnotic amnesia, the inability to remember events and experiences that took place during hypnosis.