Cockshell, Susan J, Mathias, Jane L · Journal of clinical and experimental neuropsychology · 2012 · DOI
This study tested whether people with ME/CFS perform poorly on thinking tests because they aren't trying hard enough, or because of the illness itself. Researchers gave 54 people with ME/CFS and 54 healthy people a special test designed to measure effort and intention during testing. The results showed that most people in both groups were trying their best, and very few showed signs of not putting in effort—suggesting that low effort is not the reason people with ME/CFS struggle with cognitive tasks.
This study directly addresses a common misconception that cognitive problems in ME/CFS might be psychological or motivational rather than biological. By showing that people with ME/CFS exert high effort on testing, it strengthens the case that cognitive deficits are genuine features of the illness rather than artifacts of reduced motivation or secondary to other causes.
This study does not identify what causes cognitive deficits in ME/CFS—only that low effort is not the primary explanation. It also does not measure actual cognitive function in daily life or under post-exertional malaise, and cross-sectional design means we cannot determine whether effort patterns change over time or with disease severity. The findings apply only to formal testing situations and may not reflect cognitive effort during real-world activities.
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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