This study hypothesized that highly hypnotizable Ss who remained amnesic for posthypnotic suggestions to improve body attitude would show greater changes than Ss who were not amnesic. Ss given simulating instructions were used as a comparison group to assess experimental demands. 48 females were screened with the Harvard Group Scale of Hypnotic Susceptibility, Form A (Shor & E. Orne, 1962) and assigned to one of 4 conditions: (a) high hypnotizable with amnesia suggestions, (b) high hypnotizable without suggested amnesia, (c) low hypnotizable simulators with amnesia, and (d) low hypnotizable simulators without suggested amnesia. A fifth group was formed of those high hypnotizable Ss who remembered the suggestion despite instructions to the contrary. The Body Attitude Scale (Kurtz, 1966) was administered prior to and 3 days after the experimental suggestions. Results generally demonstrated that high hypnotizable amnesic Ss manifested the greatest attitudinal and phenomenological changes as a result of the posthypnotic suggestion, although conclusions were tempered by performance of simulating Ss. The implications for hypnosis research and clinical practice are discussed.

Int J Clin Exp Hypn. 1989 Jan;37(1):15-30.