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Related Experiment Videos

Hypnosis and the EEG. A quantitative investigation.

A K Tebēcis, K A Provins, R W Farnbach

    The Journal of Nervous and Mental Disease
    |July 1, 1975
    PubMed
    Summary

    Highly hypnotizable individuals showed increased theta brainwave activity during hypnosis compared to controls. This suggests a link between frequent self-hypnosis experience, hypnotizability, and specific EEG patterns.

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    Area of Science:

    • Neuroscience
    • Psychology

    Background:

    • Hypnosis is a state of consciousness involving focused attention and reduced peripheral awareness.
    • Electroencephalography (EEG) measures electrical activity in the brain, offering insights into cognitive states.

    Purpose of the Study:

    • To quantitatively investigate EEG power spectrum differences between awake and hypnotized states.
    • To compare EEG activity in highly hypnotizable individuals with low-suggestibility controls.

    Main Methods:

    • Analysis of analogue power frequency spectrum of EEG recordings.
    • Comparison of two groups: experienced self-hypnotists (highly hypnotizable) and naive subjects (low suggestibility).
    • EEG data collected during both awake and hypnotized conditions for the experimental group, and awake condition for the control group.

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    Main Results:

    • No statistically significant differences in overall EEG power spectrum between awake and hypnotized states in the experimental group.
    • A trend towards increased theta (4-8 Hz) density was observed during hypnosis in the experimental group.
    • The experimental group exhibited significantly higher theta activity in both awake and hypnotized states compared to the control group.

    Conclusions:

    • Increased theta density in EEG may be associated with frequent self-hypnosis experience or high hypnotizability.
    • These findings suggest a potential neural correlate for hypnosis susceptibility and practice.