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Does hypnotic susceptibility influence information processing speed and motor cortical preparatory activity?

A J Srzich1, J Cirillo1, J W Stinear1

  • 1Department of Exercise Sciences, Auckland, New Zealand; Centre for Brain Research, University of Auckland, Auckland, New Zealand.

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Summary

High hypnotic susceptibility is linked to faster reaction times and distinct brain activity changes during motor preparation. This suggests a connection between hypnotic susceptibility and neural mechanisms of attention and arousal.

Keywords:
Contingent negative variationHypnosisHypnotic susceptibilityMotor preparationReaction time

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Area of Science:

  • Neuroscience
  • Psychology

Background:

  • Hypnotic susceptibility, or responsiveness to suggestions during hypnosis, has been linked to reaction time.
  • However, the specific brain activity changes associated with this relationship are not well understood.

Purpose of the Study:

  • To investigate how hypnotic susceptibility affects information processing speed and motor cortical preparatory activity.
  • To explore the neural underpinnings of faster reaction times in highly hypnotizable individuals.

Main Methods:

  • Twenty-one low and fifteen high hypnotic susceptibility participants performed simple and choice reaction time tasks.
  • Electroencephalography (EEG) recorded contingent negative variation (CNV), and electromyography (EMG) measured motor activity.
  • Participants were tested under both hypnotized and non-hypnotized conditions.

Main Results:

  • High hypnotic susceptibility participants exhibited shorter reaction times and premotor times compared to low hypnotic susceptibility participants.
  • High hypnotic susceptibility individuals made fewer errors, especially in the hypnotized state for the simple reaction time task.
  • A larger contingent negative variation (CNV) amplitude was observed in high hypnotic susceptibility participants, correlating with shorter premotor times.

Conclusions:

  • Faster reaction times in highly hypnotically susceptible individuals are associated with greater changes in brain activity during motor preparation.
  • Hypnotic susceptibility may be linked to neural mechanisms involving arousal and selective attention.