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Changes in cerebral hemispheric lateralization with hypnosis

L R Frumkin, H S Ripley, G B Cox

    Biological Psychiatry
    |December 1, 1978
    PubMed
    Summary
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    Hypnosis may shift brain activity towards the right hemisphere. This study found reduced left-hemisphere dominance during hypnosis, suggesting altered cognitive processing and potentially explaining hypnotic phenomena.

    Area of Science:

    • Neuroscience
    • Psychology
    • Cognitive Science

    Background:

    • Cerebral hemisphere dominance influences cognitive processes.
    • Hypnosis is a state of altered consciousness with complex neurological underpinnings.
    • Understanding brain activity during hypnosis is key to explaining its effects.

    Purpose of the Study:

    • To investigate changes in cerebral hemisphere dominance during hypnotic suggestion.
    • To determine if hypnosis alters hemispheric participation in cognitive tasks.
    • To explore the neurological basis of hypnotic phenomena.

    Main Methods:

    • Utilized a dichotic listening task to assess auditory laterality.
    • Measured cerebral hemisphere dominance in 20 subjects.
    • Recorded laterality scores before, during, and after hypnotic suggestion.

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    Main Results:

    • Subjects showed significantly lower right ear/left hemisphere laterality scores during hypnosis compared to baseline and recovery periods.
    • Hypnotic suggestion led to a measurable shift in hemispheric participation.
    • Evidence suggests reduced left-hemisphere dominance during the hypnotic state.

    Conclusions:

    • Hypnosis appears to facilitate increased engagement of the right cerebral hemisphere in cognitive tasks.
    • Altered hemispheric activity during hypnosis may contribute to characteristic hypnotic effects.
    • This study provides neurocognitive evidence supporting theories of hypnosis.