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Hypnosis and distraction differ in their effects on cold pressor pain
R Freeman1, A Barabasz, M Barabasz
1Washington State University, Pullman 99164-2136, USA. bfree@ellensburg.com
The American Journal of Clinical Hypnosis
|October 7, 2000
Summary
Hypnosis significantly reduces pain perception in highly hypnotizable individuals, supporting state-based theories of hypnosis. This study explored hypnosis, distraction, and relaxation effects on pain using electroencephalography (EEG).
Area of Science:
- Psychology
- Neuroscience
- Pain Management
Background:
- Theories of hypnosis include neodissociation and sociocognitive models.
- Understanding hypnosis's effect on pain perception is crucial for therapeutic applications.
Purpose of the Study:
- To investigate the differential effects of hypnosis, distraction, and relaxation on pain perception.
- To compare pain relief between high and low hypnotizable individuals.
- To examine electroencephalographic (EEG) correlates of hypnotic states and pain modulation.
Main Methods:
- Volunteers (N=20) were selected for high or low hypnotizability.
- Participants underwent a cold pressor pain test under waking relaxation, distraction, and hypnosis.
- A novel distraction task involving memorizing colored lights was employed.
- Quantitative EEG was recorded to assess brain activity.
Main Results:
- High hypnotizables reported significantly greater pain relief during hypnosis compared to distraction or relaxation.
- High hypnotizables experienced more pain relief than low hypnotizables under hypnosis.
- EEG data revealed greater theta wave activity in high hypnotizables at parietal and occipital sites during hypnosis and relaxation.
Conclusions:
- Findings support neodissociation and state-based theories of hypnosis over sociocognitive models.
- Hypnosis is an effective method for pain relief, particularly in highly hypnotizable individuals.
- EEG theta activity may be a neural marker associated with hypnotic responsiveness and pain modulation.