Cockshell, Susan J, Mathias, Jane L · Neuropsychology · 2014 · DOI
This study looked at whether people with ME/CFS who report memory and concentration problems actually perform worse on cognitive tests. Fifty people with ME/CFS and 50 healthy controls completed questionnaires about their cognitive difficulties and took standardized memory and attention tests. Surprisingly, while people with ME/CFS reported significantly more cognitive problems in daily life, both groups performed similarly on the objective tests, and reported problems didn't match test results in either group.
This study highlights an important gap in ME/CFS: the mismatch between how severe cognitive symptoms feel to patients and what standard neuropsychological tests detect. Understanding whether cognitive complaints reflect genuine functional impairment, different types of cognitive problems not captured by traditional tests, or other factors is crucial for developing appropriate interventions and validating patient experiences.
This study does not prove that ME/CFS does not cause real cognitive impairment, only that standard neuropsychological tests may not detect it. The cross-sectional design cannot establish causation or temporal relationships. The study also does not rule out that objective tests might be insensitive to the specific cognitive deficits experienced by ME/CFS patients (such as problems arising with physical exertion or post-exertional malaise).
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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