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Related Experiment Videos

Hypnosis and lateralized brain functions.

W E Edmonston1, H C Moscovitz

  • 1Department of Psychology, Colgate University, Hamilton, NY 13346.

The International Journal of Clinical and Experimental Hypnosis
|January 1, 1990
PubMed
Summary

This study on hypnosis and brain activity found no evidence of right hemisphere activation. Instead, hypnosis may reduce task-appropriate brain function in both hemispheres.

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Area of Science:

  • Neuroscience
  • Psychology
  • Cognitive Science

Background:

  • Previous research suggested right hemisphere activation during hypnosis.
  • Lateralized brain function during hypnosis remains an area of investigation.

Purpose of the Study:

  • To investigate hemispheric brain activity during hypnosis using electroencephalography (EEG).
  • To challenge the prevailing theory of right hemisphere activation during hypnosis.

Main Methods:

  • Bilateral EEG recordings were taken from 16 highly hypnotizable participants.
  • Participants performed hemisphere-specific tasks under hypnosis and a control condition.
  • Counterbalanced order and within-subject design were employed.

Main Results:

  • The study found no support for the right hemisphere activation theory.
  • Data suggest a general reduction in task-appropriate brain activity during hypnosis.
  • Potential misinterpretations arise from neglecting baseline activity and using ratios for lateralization.

Conclusions:

  • The interpretation of lateralized brain function during hypnosis requires re-evaluation.
  • Future research should consider activity changes in separate hemispheres.
  • Hypnosis may be associated with a decrease in task-specific neural engagement.

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