Smith, A P, Behan, P O, Bell, W et al. · British journal of psychology (London, England : 1953) · 1993 · DOI
This study tested whether people with ME/CFS actually experience the memory, concentration, and coordination problems they report. Researchers gave 57 ME/CFS patients and 19 healthy controls a series of computerized tests measuring thinking speed, memory, attention, and motor skills. ME/CFS patients performed worse on many tests—they were slower at tasks requiring coordination, had trouble focusing, and struggled with complex reasoning—even though their depression and anxiety levels didn't fully explain these differences.
This study provides objective evidence that cognitive and motor complaints in ME/CFS are real measurable deficits, not simply psychological symptoms or complaints without physical basis. Demonstrating that these impairments exist independently of depression and anxiety helps validate patient experiences and supports the neurobiological nature of ME/CFS, potentially improving recognition by healthcare providers.
This study does not prove what causes the cognitive and motor dysfunction—only that it exists and is not entirely explained by mood disorders. As a cross-sectional snapshot, it cannot establish whether these deficits develop before, during, or after ME/CFS onset, nor whether they are reversible or progressive. The modest sample size and single-timepoint assessment limit generalizability to all ME/CFS populations.
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 →
Contribute
Private, reviewed by a human. Not a public comment thread.