Chapter 6 – EEG imaging 209 higher during nocebo pain compared to baseline high pain. Interestingly, gamma power and LRTC were lower, suggesting that complexity of neuronal oscillations is lower, during nocebo-augmented pain compared to high pain at baseline. Indeed, based also on the results above, the complexity of neuronal oscillations seems to increase, from resting-state, to nocebo-augmented pain, to high administered pain. No significant relationship between questionnaire scores and EEG biomarkers Finally, we expected that there would be a relationship between scores on pain-related questionnaires and measures of EEG. Spearman’s rank order correlations were conducted between total scores on each of the questionnaires (FPQ, PCS, and ECIP) and changes in resting-state EEG biomarker values from before to after nocebo induction. After correcting for multiple comparisons, no significant correlations were found between questionnaire scores and any of the biomarker values in any clusters of electrodes (supplementary material).
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