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Modulations of pain sensations
R Peyron1, F-B Pomares, I Faillenot
1U1028 Inserm, Central Integration of Pain, Neuroscience Research Center, Saint-Étienne, France. roland.peyron@univ-st-etienne.fr
Neurophysiologie Clinique = Clinical Neurophysiology
|October 9, 2012
Summary
Believing time is on your side can reduce pain perception. This effect is most potent for long, intense pain, suggesting time context influences pain modulation.
Area of Science:
- Neuroscience
- Psychology
- Pain Research
Background:
- Perception of time significantly influences subjective experiences, including pain.
- Previous research suggests temporal context can modulate pain perception, but mechanisms remain unclear.
Purpose of the Study:
- To investigate how the representation of time affects pain perception.
- To determine if altering perceived time duration influences pain intensity.
- To explore the neural correlates of time-based pain modulation.
Main Methods:
- Volunteers were exposed to identical pain stimuli under two conditions: viewing actual time and viewing a manipulated clock suggesting shorter duration.
- Pain perception was assessed during exposure to varying intensities and durations of thermal stimuli.
- Brain activity was monitored, with a focus on the posterior parietal cortex.
Main Results:
- Perceiving time as shorter significantly reduced pain perception.
- This time-based pain modulation was most effective for high-intensity pain stimuli lasting at least 25 seconds.
- The effect was absent for shorter stimuli (15 minutes) and unaffected by clock color or visual cues (smileys).
Conclusions:
- The subjective representation of time can effectively modulate pain perception, particularly for prolonged and intense painful stimuli.
- The right upper and posterior parietal cortex likely plays a role in this time-based pain modulation.
- Findings contribute to understanding the "pain matrix" and its temporal dynamics.
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