Aoun Sebaiti, Mehdi, Hainselin, Mathieu, Gounden, Yannick et al. · Scientific reports · 2022 · DOI
This large review examined research on thinking and memory problems in ME/CFS by looking at 764 studies published over 30 years. The researchers found that people with ME/CFS commonly experience difficulties with memory (especially visual and verbal memory), processing speed when reading, and attention, but their problem-solving and basic mental functions are usually preserved. The study shows that cognitive problems in ME/CFS are real and measurable, though they vary from person to person.
This study provides robust evidence that cognitive impairment in ME/CFS is a measurable neuropsychological phenomenon rather than solely a subjective complaint, validating patient experiences of 'brain fog.' Understanding the specific pattern of cognitive deficits can help clinicians recognize ME/CFS-related cognition problems and guide future research into underlying mechanisms.
This meta-analysis documents associations between ME/CFS and cognitive impairment but does not establish causation or identify the biological mechanisms responsible. The study also cannot determine whether cognitive problems precede ME/CFS onset, worsen with disease severity, or predict treatment outcomes. Heterogeneity across studies means individual patient presentations may differ significantly from group patterns.
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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