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Experimental changes in pain threshold and severe pain threshold for electrically induced pain
J L Collier1, B M Mehta, F G Spear
1University Department of Psychiatry, Sheffield, U.K.
Journal of Psychosomatic Research
|January 1, 1990
Summary
Repeated painful stimuli can alter pain perception. Experiment 2 showed a significant reduction in the severe pain threshold, indicating a potential desensitization effect.
Area of Science:
- Neuroscience
- Pain Research
- Human Physiology
Background:
- Pain perception is complex and influenced by stimulus characteristics.
- Individual variability in pain thresholds is well-documented.
- Understanding how repeated stimuli affect pain is crucial for pain management.
Purpose of the Study:
- To investigate the effects of repeated painful stimuli on pain and severe pain thresholds.
- To determine if stimulus intensity and pattern influence pain threshold changes.
- To explore individual variations in pain threshold responses.
Main Methods:
- Two experiments involving normal volunteers measuring pain and severe pain thresholds.
- Experiment 1: Constant painful stimuli at varying levels between thresholds.
- Experiment 2: Stimuli increasing from non-painful to moderate levels.
Main Results:
- Experiment 2 demonstrated a significant reduction in the severe pain threshold (p < 0.001).
- Marked individual variations observed, with increases and decreases in thresholds.
- No subject showed opposite directional changes in both thresholds.
Conclusions:
- Repeated painful stimuli, particularly those increasing in intensity, can significantly reduce the severe pain threshold.
- Individual responses to repeated painful stimuli vary considerably.
- Stimulus characteristics, such as intensity and pattern, play a role in modulating pain perception.
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