Vercoulen, J H, Bazelmans, E, Swanink, C M et al. · Journal of clinical and experimental neuropsychology · 1998 · DOI
This study looked at whether people with ME/CFS have problems with thinking, memory, and concentration. Researchers tested patients using standard cognitive tests and also asked them to report their own memory and concentration difficulties. Surprisingly, most patients performed normally on the tests, and there was no clear connection between test results and what patients reported experiencing in daily life.
Understanding the nature of cognitive difficulties in ME/CFS is crucial because 'brain fog' is a hallmark symptom patients report. This study challenges assumptions about cognitive impairment and highlights a disconnect between what patients experience and what standard tests measure, suggesting that current neuropsychological assessments may miss ME/CFS-specific cognitive problems or that reported symptoms reflect different underlying mechanisms.
This study does not prove that ME/CFS does not cause cognitive problems; rather, it suggests standard neuropsychological tests may not capture the specific cognitive difficulties patients experience. The cross-sectional design cannot establish causation, and the finding that objective test performance doesn't match self-report doesn't explain why patients report these symptoms. The study also does not address whether cognitive difficulties fluctuate over time or with disease severity.
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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