title: The efficacy of the Waterloo-Stanford Group Scale of hypnotic susceptibility: form C.
abstract: This study explored whether the Waterloo-Stanford Group Scale of Hypnotic Susceptibility Form: C (WSGC) approximates the predictive power of the individually administered Stanford Hypnotic Susceptibility Scale: Form C (SHSS: C). Seventy-one undergraduates were administered the WSGC in a group setting and then tested individually on the SHSS: C. The participants were then hypnotized and tested on four types of targeted hypnotic behaviors sampled from the Revised Stanford Profile Scale of Hypnotic Susceptibility: I & II (RSPSHS: I & II). The following four factors were chosen: (a) cognitive distortion; (b) positive hallucination; (c) negative hallucination, and (d) dreams and regression. The items from these factors were matched on difficulty level. A series of multiple regression and logistic regression analyses were performed. The Waterloo: C was found to match the SHSS: C on predictive power for only one of the four hypnotic factors: "dreams and regression." On the other three factors, the SHSS: C was clearly superior in predictive efficacy. These results mirror previous research (Kurtz & Strube, 1996) that examined other group scales of hypnotic susceptibility in relation to the individually administered SHSS: C. In general, group scales such as the WSGC are poor substitutes for the SHSS: C.
authors.affiliation: Department of Psychology, Washington University, Campus Box 1125, One Brookings Drive, St. Louis, MO 63130, USA.
authors.forename: Tracy E
authors.initials: TE
authors.lastname: Moran
authors.forename: Richard M
authors.initials: RM
authors.lastname: Kurtz
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Strube
mesh_terms: D000328:Adult; D003071:Cognition; D005260:Female; D006212:Hallucinations; D006801:Humans; D006990:Hypnosis / Q000379:methods; D008297:Male; D015203:Reproducibility of Results; D013404:Suggestion; D011795:Surveys and Questionnaires