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40-Hz EEG activity during hypnotic induction and hypnotic testing.

V DePascalis¹, P M Penna

¹Dipartimento di Psicologia, Universita di Roma, La Sapienza, Italia.

The International Journal of Clinical and Experimental Hypnosis

|April 1, 1990

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High hypnotizable individuals show increased right-hemisphere brain activity during hypnosis, unlike low hypnotizable individuals. These brain activity differences correlate with hypnotic susceptibility and amnesia.

Area of Science:

Neuroscience
Psychology

Background:

Hypnotizability, the degree to which an individual can be hypnotized, is a stable trait.
Previous research suggests potential differences in brain activity between high and low hypnotizable individuals.

Purpose of the Study:

To investigate changes in 40-Hz electroencephalogram (EEG) production in the left and right hemispheres during hypnotic induction and susceptibility testing.
To explore the relationship between brain activity, hypnotizability, and hypnotic suggestion experience.

Main Methods:

19 high and 20 low hypnotizable female participants underwent hypnotic induction and completed the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C).
40-Hz EEG density was recorded from specific scalp regions (O1-P3-T5 and O2-P4-T6 triangles).

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Main Results:

High hypnotizable participants showed increased right-hemisphere activity during induction compared to a resting state.
Low hypnotizable participants exhibited reduced activity in both hemispheres.
Significant interactions were found between hypnotizability, hemisphere, and trial for sensory distortion and imaginative items.
Differences in 40-Hz EEG activity correlated with the ability to experience hypnotic suggestions and the level of amnesia.

Conclusions:

Hemispheric EEG activity patterns differ between high and low hypnotizable individuals during hypnosis.
Brain activity variations may partially explain differences in responding to hypnotic suggestions.
40-Hz EEG production is significantly related to hypnotizability and amnesia levels.