Schmaling, K B, DiClementi, J D, Cullum, C M et al. · Psychosomatic medicine · 1994 · DOI
Researchers tested thinking and memory skills in 16 people with ME/CFS and 23 people with depression using a brief set of mental tests. Both groups performed similarly to each other and scored in the normal range on most tests. Interestingly, people with ME/CFS reported more cognitive problems than their test scores showed, which the researchers suggest might be due to increased attention to physical sensations rather than actual cognitive damage.
This study addresses a common concern among ME/CFS patients—cognitive difficulties—by objectively measuring cognitive function. The findings suggest that the reported thinking and memory problems in ME/CFS may not reflect actual cognitive impairment on standardized tests, which has implications for how clinicians diagnose and counsel patients about their condition.
This study does not prove that cognitive complaints in ME/CFS are purely psychological or imagined. The small sample sizes and use of a brief test battery limit generalizability; more comprehensive cognitive testing in larger populations may reveal subtle deficits that brief measures miss. Additionally, the cross-sectional design cannot establish whether subjective cognitive symptoms precede, follow, or are independent of the disease process.
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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