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Short-term cortical plasticity induced by conditioning pain modulation.

Line Lindhardt Egsgaard¹, Line Buchgreitz, Li Wang

¹Center for Sensory Motor Interaction, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Frederik Bajers Vej 7A, 9220 Aalborg East, Denmark.

Experimental Brain Research

|November 3, 2011

Summary

Conditioning pain modulation (CPM) affects pain perception and brain activity. Homotopic CPM reduced pain sensitivity without cortical changes, while heterotopic CPM induced cortical plasticity in the cingulate cortex.

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Area of Science:

Neuroscience
Pain Research
Neurophysiology

Background:

Conditioning pain modulation (CPM) is a top-down endogenous analgesic mechanism.
Investigating CPM's effects on cortical plasticity is crucial for understanding pain modulation.

Purpose of the Study:

To examine the impact of homotopic and heterotopic CPM on short-term cortical plasticity.
To correlate cortical changes with pain perception.

Main Methods:

Glutamate injections induced tonic pain in upper trapezius (homotopic) or thenar (heterotopic) muscles.
Electrical stimulation and 128-channel EEG recorded somatosensory evoked potentials.
Dipole source analysis estimated cortical activity changes before, during, and after CPM.

Main Results:

Homotopic CPM induced hypoalgesia but no significant cortical changes.
Heterotopic CPM showed no hypoalgesia but induced cortical plasticity in the cingulate cortex, correlated with pain ratings.
Correlations were found between pain thresholds, dipole locations, and subjective pain ratings.

Conclusions:

Heterotopic CPM induces short-term cortical plasticity in the cingulate cortex related to pain perception.
Homotopic CPM's long-term depressive effects correlate with P200 dipole location changes.
CPM differentially affects pain modulation and cortical plasticity.