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Memory traces of pain in human cortex.

Marie-Claire Albanese1, Emma G Duerden, Pierre Rainville

  • 1Department of Psychology, McGill University, Montréal, Québec, Canada H3A 1B1.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
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Summary

This study reveals how the brain remembers pain. The primary somatosensory cortex/posterior parietal cortex (SI/PPC) and anterior insular cortex (aIC) are key for recalling pain

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Area of Science:

  • Neuroscience
  • Pain Perception
  • Cognitive Neuroscience

Background:

  • Distinct brain regions process sensory and affective pain components.
  • The role of these regions in pain memory remains unclear.

Purpose of the Study:

  • Investigate short-term memory for sensory features of cutaneous heat pain.
  • Utilize functional magnetic resonance imaging (fMRI) and a delayed-discrimination paradigm.

Main Methods:

  • Subjects performed delayed-discrimination tasks for pain location and intensity.
  • Compared brain activity during memory vs. control trials using fMRI.
  • Analyzed stimulus-evoked activity and memory-specific activity during the interstimulus interval.

Main Results:

  • Pain processing regions (SI/PPC, SII, aIC) showed similar activity for memory and control trials.
  • Memory-specific activity was observed in the SI/PPC and aIC, but not SII.
  • Anterior cingulate cortex, linked to pain unpleasantness, showed no memory-specific activation.

Conclusions:

  • SI/PPC is involved in retaining spatial and intensity aspects of noxious stimuli.
  • aIC integrates sensory and cognitive components of pain perception, including memory.
  • Remembering affective pain components was not required for this sensory discrimination task.