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Related Experiment Videos

Posthypnotic amnesia for material learned before hypnosis

R A Bryant1, A J Barnier, D Mallard

  • 1School of Psychology, University of New South Wales, Sydney, Australia. R.Bryant@unsw.edu.au

The International Journal of Clinical and Experimental Hypnosis
|January 16, 1999
PubMed
Summary
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This study explored post-hypnotic amnesia effects on memory recall. Learning material before or during hypnosis did not impact performance, suggesting amnesia effects may be influenced by other factors.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Clinical Psychology

Background:

  • Post-hypnotic amnesia is a phenomenon where individuals forget information after hypnosis.
  • Understanding the factors influencing post-hypnotic amnesia is crucial for memory research.

Purpose of the Study:

  • To investigate the effect of learning time (before vs. during hypnosis) on post-hypnotic amnesia.
  • To examine the relationship between hypnotizability and the effectiveness of amnesia suggestions.
  • To explore the utility of post-hypnotic amnesia as a model for autobiographical memory disorders.

Main Methods:

  • Two experiments were conducted using participants with varying hypnotizability levels.
  • Participants learned a word list either before or during hypnosis.

Related Experiment Videos

  • A post-hypnotic amnesia suggestion was administered during hypnosis.
  • Memory recall was assessed using direct memory measures and word-fragment completion tasks.

    • Main Results:

    • No significant difference in memory performance was found based on whether the word list was learned before or during hypnosis.
    • High hypnotizability was associated with amnesia on direct memory measures in Experiment 1.
    • Demand characteristics could not be ruled out as an explanation for amnesia in Experiment 2.

    Conclusions:

    • The timing of learning relative to hypnosis does not appear to influence post-hypnotic amnesia.
    • While high hypnotizability may correlate with amnesia, alternative explanations like demand characteristics need consideration.
    • Post-hypnotic amnesia may serve as a limited analog for studying autobiographical memory disorders.