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Pain perception, obstructive imagery and phase-ordered gamma oscillations.

Vilfredo De Pascalis1, Immacolata Cacace

  • 1Department of Psychology, University of Rome La Sapienza, Italy. v.depascalis@caspur.it

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|April 5, 2005
PubMed
Summary

Mental imagery reduces pain perception by altering brain wave activity. Specifically, obstructive mental imagery decreased pain ratings, linked to changes in gamma oscillations in the brain.

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Area of Science:

  • Neuroscience
  • Pain Perception Research
  • Brain Oscillations

Background:

  • Neural mechanisms of pain perception and mental imagery's anti-nociceptive effects are unclear.
  • Previous research linked somatosensory event-related gamma oscillations (38-42 Hz) to pain perception.

Purpose of the Study:

  • To investigate the role of EEG oscillations in pain perception and reduction via obstructive mental imagery.
  • To identify specific brainwave patterns associated with pain and its modulation.

Main Methods:

  • 38 subjects performed a painful stimulus detection task under 'pain' (counting) and 'obstructive imagery' conditions.
  • EEG data analyzed for phase-ordered oscillations in beta (26-46 Hz) and gamma (34-46 Hz) bands.
  • Correlation analysis examined the relationship between EEG patterns and reported pain ratings.

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Main Results:

  • Obstructive mental imagery significantly reduced pain perception compared to the pain condition.
  • This reduction correlated with decreased phase-ordered gamma2 (38-42 Hz) and gamma3 (42-46 Hz) oscillations over the Cz scalp site.
  • Phase-ordered oscillations in gamma bands at Cz predicted pain ratings during the pain condition.
  • Gamma band oscillations over frontal and parietal sites best predicted pain ratings during obstructive imagery.

Conclusions:

  • Provides evidence for the role of gamma oscillations in the subjective experience of pain.
  • Supports the hypothesis that pain reduction via obstructive mental imagery involves inhibitory processes in frontal and parietal cortical regions.