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Brain slow potentials and hypnosis

P A Rizzo, G Amabile, R Fiumara

    Biological Psychiatry
    |June 1, 1980
    PubMed
    Summary
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    Hypnosis significantly alters brain activity, specifically reducing contingent negative variation (CNV) voltage and introducing a post-inhibition negativity (PINV) in hypnotizable individuals. Non-hypnotizable subjects showed no such changes, highlighting hypnosis-specific neural correlates.

    Area of Science:

    • Neuroscience
    • Psychophysiology
    • Cognitive Science

    Background:

    • Contingent negative variation (CNV) is a slow negative cortical potential reflecting cognitive processing and response preparation.
    • Understanding the neural mechanisms underlying hypnosis is crucial for its therapeutic applications and for clarifying consciousness states.

    Purpose of the Study:

    • To investigate the impact of hypnotic trance and emotional suggestions on contingent negative variation (CNV) behavior.
    • To compare CNV changes in hypnotizable subjects versus non-hypnotizable controls.

    Main Methods:

    • Electrophysiological recordings of CNV were performed on 12 voluntary normal subjects in basal and hypnotic states.
    • Emotional suggestions were administered during hypnosis.
    • 12 non-hypnotizable subjects served as controls under identical experimental conditions.

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    Main Results:

    • A significant decrease in CNV voltage was observed in the hypnotic state.
    • The appearance of a post-inhibition negativity (PINV) was noted during hypnosis.
    • No modifications in CNV were found in the non-hypnotizable control group.

    Conclusions:

    • Hypnotic trance state induces measurable changes in electrophysiological brain activity, specifically affecting CNV.
    • The observed CNV modifications are specific to hypnotizable individuals, suggesting a neurophysiological basis for hypnotic susceptibility.
    • These findings contribute to understanding the neural correlates of altered states of consciousness induced by hypnosis.