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Related Experiment Videos

Lateral asymmetry in visual detection under hypnosis.

E J Hass1, C W Holden

  • 1Department of Psychology, Franklin & Marshall College, Lancaster, PA 17604.

Perceptual and Motor Skills
|December 1, 1987
PubMed
Summary

Hypnosis primes the right cerebral hemisphere, enhancing visual detection in the left visual field. This study demonstrates a material-nonspecific priming effect related to cognitive processing resources.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Neuroscience

Background:

  • Hypnotic states may involve differential cerebral hemisphere activation.
  • Previous research suggests right hemisphere priming during hypnosis.

Purpose of the Study:

  • To investigate if hypnosis induces a right hemisphere priming effect.
  • To examine lateralized visual processing differences under hypnosis.

Main Methods:

  • A visual-detection task using outline squares with a gap.
  • Presentation of stimuli to the left and right visual fields.
  • Response time measurement in hypnotized, control, and simulator-control groups.

Main Results:

  • Hypnotized subjects showed faster response times for stimuli in the left visual field (indicating right hemisphere processing).
  • A significant 50-msec. response time difference favoring left visual field presentation was observed in hypnotized subjects.
  • Control and simulator-control groups did not exhibit such lateral asymmetries.

Conclusions:

  • Hypnosis can induce a material-nonspecific priming effect.
  • The findings support the hypothesis of right hemisphere relative activation during hypnosis.
  • This effect may be related to the nature of processing resources utilized during hypnotic states.

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