Michiels, V, Cluydts, R, Fischler, B et al. · Journal of clinical and experimental neuropsychology · 1996 · DOI
This study found that people with ME/CFS performed worse than healthy controls on thinking and memory tests. Patients showed slower processing speed, difficulty concentrating, and trouble learning and remembering new information. However, the researchers noted that cognitive problems varied widely between patients, so not everyone with ME/CFS experiences the same level of difficulty.
This research provides objective neuropsychological evidence of cognitive dysfunction in ME/CFS, validating patient reports of 'brain fog' and concentration problems. Understanding which specific cognitive domains are affected helps clinicians assess patients and supports efforts to recognize ME/CFS as a neurobiological condition rather than purely psychological.
This study cannot determine whether cognitive impairment is caused by ME/CFS pathology, is secondary to fatigue or other symptoms, or reflects pre-existing differences. The cross-sectional design prevents investigation of whether cognitive problems improve or worsen over time, or their relationship to disease progression.
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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