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Multiple Brain Networks Mediating Stimulus-Pain Relationships in Humans
Stephan Geuter1,2,3, Elizabeth A Reynolds Losin4, Mathieu Roy5
1Department of Biostatistics, Johns Hopkins University, Baltimore, MD, USA.
Cerebral Cortex (New York, N.Y. : 1991)
|March 29, 2020
Summary
Researchers mapped brain networks mediating pain perception using advanced analysis of fMRI data. This reveals new brain targets for pain interventions by understanding how nociceptive input becomes a complex pain experience.
Area of Science:
- Neuroscience
- Pain Research
- Medical Imaging
Background:
- The brain integrates nociceptive input into a multifaceted pain experience.
- The precise neural mechanisms and brain networks generating pain remain incompletely understood.
Purpose of the Study:
- To develop and apply a novel high-dimensional mediation analysis technique.
- To identify distributed brain network patterns mediating the relationship between stimulus intensity and pain perception.
Main Methods:
- Applied a new mediation analysis technique to functional magnetic resonance imaging (fMRI) data from 284 participants.
- Analyzed trial-to-trial variations in pain reports in relation to noxious stimulus intensity.
Main Results:
- Identified brain mediators in both classical nociceptive pathways and non-nociceptive regions (prefrontal, midbrain, striatal, default-mode).
- These whole-brain mediators are specific to pain (vs. aversive sounds) and form five functional networks.
- The identified brain mediators demonstrated superior prediction of pain ratings compared to existing measures like the neurologic pain signature.
Conclusions:
- Provides a comprehensive network-level understanding of pain experience generation.
- Highlights novel brain regions and networks as potential targets for pain management interventions.
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