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Hypnotic alteration of somatosensory perception
D Spiegel1, P Bierre, J Rootenberg
1Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, CA 94305.
The American Journal of Psychiatry
|June 1, 1989
Summary
Highly hypnotizable individuals showed altered brain responses (somatosensory event-related potentials) during hypnosis. This suggests a neurophysiological basis for how hypnosis can modify sensory perception and reduce pain.
Area of Science:
- Neuroscience
- Psychology
- Cognitive Science
Background:
- Hypnosis is a state of consciousness involving focused attention and reduced peripheral awareness.
- Individual differences in hypnotizability exist, with some individuals responding more profoundly than others.
- Previous research suggests hypnosis can alter sensory perception and modulate pain, but the underlying neural mechanisms are not fully understood.
Purpose of the Study:
- To investigate the effects of hypnotic alterations of perception on somatosensory event-related potentials (ERPs).
- To compare brain responses between highly hypnotizable and low hypnotizable individuals under hypnotic suggestion.
- To explore the neurophysiological basis of hypnotic sensory modulation.
Main Methods:
- Somatosensory event-related potentials (ERPs) were recorded in 10 highly hypnotizable and 10 low hypnotizable subjects.
- Subjects underwent hypnotic conditions involving either blocking perception (hallucination) or intensifying attention to a stimulus.
- Changes in the amplitude of specific ERP components (P100 and P300) were analyzed.
Main Results:
- Highly hypnotizable subjects exhibited significant decreases in P100 and P300 amplitudes during hypnotic hallucination that blocked stimulus perception.
- Intensifying attention to the stimulus via hypnosis led to an increase in P100 amplitude in highly hypnotizable individuals.
- Low hypnotizable subjects did not show comparable ERP changes, indicating hypnotizability-specific effects.
Conclusions:
- Hypnotic sensory alteration is associated with measurable changes in somatosensory evoked potentials.
- These findings provide neurophysiological evidence supporting the capacity of hypnosis to modulate sensory perception.
- The results align with the understanding that highly hypnotizable individuals can utilize cognitive strategies, like hypnosis, for pain reduction and sensory management.