POSTHYPNOTIC AMNESIA FOR MATERIALS LEARNED DURING HYPNOSIS ON IMPLICIT MEMORY
Okabe, Y., Muroi, M., Saitoh, M., Nihon University, Japan
This study investigated the effect of posthypnotic amnesia (PHA) for materials learned during hypnosis on implicit memory. Seventy -two subjects were administrated for a Japanese translation (Saito, 1974) of the Harvard Group Scale of Hypnotic Susceptibility, Form A(HGSHS:A; Shor & Orne, 1962) in groups of 15 to 20. The subjects in the middle of HGSHS:A were told to learn a presented list of 9 words and then in the end of HGSHS:A were given PHA suggestions of the list. After HGSHS:A, they were two times tested them on implicit memory task (word-fragment completion task) before and after PHA release. The result showed no differences between pre and post PHA release in consistent with previous research. It is interesting that priming level remained low after PHA release and the proportion of completion for learned word was almost the same as that for no learned word. These findings suggest the methodological issue on PHA research or the strong effect of PHA on implicit memory.