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Anatomical localization and intra-subject reproducibility of laser evoked potential source in cingulate cortex, using
D E Bentley1, P D Youell, A K P Jones
1Human Pain Research Group, University of Manchester Rheumatic Diseases Centre, Clinical Sciences Building, Hope Hospital, Eccles Old Road, Salford, UK. deborah.bentley@man.ac.uk
Summary
This study precisely located the brain source of late laser evoked potentials (LEPs) in the cingulate cortex. The findings show high reproducibility, indicating these caudal cingulate regions are involved in pain processing.
Area of Science:
- Neuroscience
- Pain Research
- Electrophysiology
Background:
- Late laser evoked potentials (LEPs) are used to study pain pathways.
- Accurate source localization of LEPs is crucial for understanding pain processing.
Purpose of the Study:
- To accurately localize the cingulate source of late laser evoked potentials (LEPs) using a realistic, individualized head model.
- To assess the within-subject reproducibility of this LEP source localization.
Main Methods:
- Late LEPs were recorded from 62 electrodes in one healthy subject following painful CO2 laser stimulation.
- Recordings were repeated 9 times over 3 days.
- Dipole source localization was performed on the P2 peak using a head model derived from structural MRI.
Main Results:
- The P2 LEP peak was consistently localized to the border of the left anterior and posterior cingulate cortex.
- The mean residual variance was low (1.7+/-0.4%).
- The maximum standard deviation in dipole location across repetitions was 3.2 mm.
Conclusions:
- The cingulate source of late LEPs is highly reproducible within a subject using this method.
- Caudal cingulate regions are suggested to be involved in pain processing.