Parallel processing of nociceptive A-delta inputs in SII and midcingulate cortex in humans
Maud Frot1, François Mauguière, Michel Magnin
1Inserm, U879, Bron, F-69677 France. maud.frot@univ-lyon1.fr
Summary
The posterior midcingulate cortex (pMCC) processes pain rapidly, challenging the view of the medial pain system as solely for slow emotional responses. This area is involved in fast attention and motor withdrawal, alongside the lateral system.
Area of Science:
- Neuroscience
- Pain Perception
- Somatosensory Cortex
Background:
- The cingulate cortex (CC) is part of the medial pain system, typically associated with slow affective/cognitive pain processing.
- The lateral SII-insular cortex is known for fast sensory-discriminative pain coding.
Purpose of the Study:
- To investigate the location and timing of CC responses to painful stimuli.
- To explore the entire rostrocaudal extent of the CC using intracortical recordings in humans.
Main Methods:
- Intracortical recordings in humans following painful laser stimuli.
- Exploration of the entire rostrocaudal extent of the cingulate cortex.
Main Results:
- A specific area in the posterior midcingulate cortex (pMCC) responded to painful stimuli.
- Cingulate pain responses exhibited early components with latencies similar to the SII.
- Nociceptive processing occurs simultaneously in medial (pMCC) and lateral (SII) pain systems.
Conclusions:
- The medial pain system, specifically the pMCC, is involved in rapid attentional orienting and motor withdrawal, not just slow emotional processing.
- Short-latency pMCC responses indicate parallel processing within medial and lateral pain pathways.
- The medial pain system contributes to fast pain responses alongside the lateral system's sensory-discriminative functions.
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