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Updated: Aug 13, 2026
07:12
Chronic Post-Ischemia Pain Model for Complex Regional Pain Syndrome Type-I in Rats
Published on: January 21, 2020
Stable insular spectral patterns underlie dynamic pain encoding in chronic neuropathic pain
Chang-Chia Liu1, Mark Quigg2, Patrick H Finan3
1Department of Neurological Surgery, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
Brain Communications
|August 12, 2026
Summary
Stable brain patterns in the insula underlie chronic neuropathic pain. Daily pain fluctuations correlate with specific brainwave activity in the posterior insula, offering potential biomarkers for pain tracking.
Area of Science:
- Neuroscience
- Pain Research
- Brain Imaging
Background:
- Chronic neuropathic pain is long-lasting but varies daily.
- The insula's role in pain processing is key, but its stable vs. dynamic activity patterns in pain are unclear.
Purpose of the Study:
- To investigate stable neural patterns versus daily fluctuations in the insula related to chronic neuropathic pain.
- To determine if baseline insular activity or day-to-day variations correlate with pain intensity and unpleasantness.
Main Methods:
- Analyzed multiday intracranial electroencephalography (iEEG) from six individuals with chronic neuropathic pain.
- Quantified spectral power, peak metrics, and intra-insular connectivity across insular subregions.
- Used linear mixed-effects models to differentiate stable patterns from daily pain fluctuations, controlling for temporal drift.
Main Results:
- Identified stable insular spectral organization with an anterior-posterior gradient, differing between hemispheres.
- Daily pain intensity linked to increased contralateral posterior alpha power (33% variance).
- Pain unpleasantness linked to increased contralateral posterior beta power (19% variance).
Conclusions:
- Chronic neuropathic pain involves stable insular spectral patterns.
- Frequency-specific oscillations in the posterior insula (alpha and beta) correlate with daily pain intensity and unpleasantness.
- Posterior insular spectral power may serve as a physiological marker for tracking pain states.
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