Comparative efficacy of hypnotic behavioral training and sleep/trance hypnotic induction: Comment on Katz.

Examines the claim by N. W. Katz (see record 1979-26454-001) that social-learning hypnotic inductions produce significant gains in hypnotizability relative to a traditional sleep/trance hypnotic induction. His use of a "raw gain-score analysis" is criticized because it fails to identify the significant influences of pretreatment individual differences on posttreatment response. Reanalysis of Katz's data indicates a highly significant pretest effect more potent than the observed treatment effect. Inconsistencies between Katz's findings and those of 6 previous studies are examined. (14 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)