Flor-Henry, Pierre, Lind, John C, Koles, Zoltan J · Psychiatry research · 2010 · DOI
Researchers used a specialized brain-wave test (EEG) to compare 61 women with ME/CFS to 80 healthy women. The brain activity patterns were different between the two groups, especially when the women were doing mental tasks. The computer could correctly identify who had ME/CFS based on these brain patterns about 72-83% of the time.
This study provides objective, neurophysiological evidence that ME/CFS is associated with measurable differences in brain electrical activity, supporting the biological basis of the condition. The findings suggest that EEG source analysis might eventually serve as a complementary diagnostic or monitoring tool, and they indicate that the brain's processing during cognitive tasks is altered in ME/CFS.
This study does not establish whether the EEG differences cause ME/CFS symptoms or result from the illness; it only shows correlation. The cross-sectional design cannot determine if these brain patterns are stable over time or change with treatment. Results are limited to right-handed, unmedicated women and may not generalize to the broader ME/CFS population, including men or those taking medications.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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