Frequency-domain EEG source analysis for acute tonic cold pain perception

Area of Science:

• Neuroscience
• Pain Research
• Electrophysiology

Background:

• Tonic cold pain perception involves complex neural processing.
• Objective measures for acute pain assessment are needed.
• Electrocortical activity, particularly in specific frequency bands, may serve as pain biomarkers.

Purpose of the Study:

• To investigate electrocortical responses to tonic cold pain using frequency-domain electroencephalogram (EEG) source analysis.
• To identify potential electrocortical indices of acute tonic pain.

Main Methods:

• Scalp EEG data were recorded from 26 healthy subjects under tonic cold pain (CP) and no-pain control (NP) conditions.
• Standardized low-resolution brain electromagnetic tomography (sLORETA) was used for EEG source localization.
• EEG power spectra and source power were compared across five frequency bands (1-4 Hz, 4-8 Hz, 8-12 Hz, 12-18 Hz, 18-30 Hz).

Main Results:

• Significant differences in source power between CP and NP conditions were observed in the 8-12 Hz (CPNP) bands across extensive brain regions.
• Significant differences in 4-8 Hz and 12-18 Hz source activities were also found.
• Left medial frontal, left superior frontal, anterior cingulate, and posterior cingulate activities in specific frequency bands negatively correlated with subjective pain ratings.

Conclusions:

• Tonic cold pain perception is associated with cortical source power changes across multiple frequency bands and brain regions.
• Oscillatory activities in the prefrontal and cingulate regions correlate with subjective pain intensity.
• These findings suggest potential objective measures for pain assessment and targets for pain treatment through neural oscillation modulation.