Cognitive Stage Regression through Hypnosis: Are Earlier Cognitive Stages Retrievable?

Abstract

Piagetian theory maintains that stage sequence is invariant due to irreversible transformations of cognitive structure which characterize development. The present study aimed to test this claim by attempting to stage-regress hypnotized and hypnosis-simulating adults. A prediction discrepancy technique was used whereby 3 tasks (conservation of volume, horizontality, and seriation) and target ages (8, 7, and 5 years) were selected based on evidence of failure by actual children, but adult predictions of success by children. Under both regressed and simulating conditions, adult task scores were substantially higher than those of actual children, though slightly lower than scores obtained during the normal adult state. The modest partial regression obtained suggests superficial performance adjustments attributable to procedure demand characteristics or to enhancement of role playing rather than temporary modifications of cognitive structure.