Posthypnotic suggestions and behavior change: Highly hypnotizables compared with simulators

The authenticity of a posthypnotically released emotion was examined to see whether this emotion also could modify the reaction times (RTs) of subjects. The simulant design proposed by Orne (1979) was utilized, with 10 highly hypnotizable subjects and 10 non-hypnotizable simulators participating in the experiment. The subjects received a post-hypnotic suggestion to the effect that every presentation of a light stimulus would release a feeling of discomfort and that a second light stimulus would be neutral. They were informed that they could terminate the stimulation by pressing a RT switch and received a suggestion of amnesia for the posthypnotic suggestion. The simulators skilfully imitated the objective behavior of the hypnotic subjects; their physiological reactions increased and their RTs were shorter when exposed to the aversive stimulation. The main differences occurred in the subjective reports. The hypnotic subjects reported that the emotion was released involuntarily and found relief in escaping from it, while the simulators reported no corresponding experiences, saying that they had deliberately manipulated the objective behavior.