Schrijvers, D, Van Den Eede, F, Maas, Y et al. · Journal of affective disorders · 2009 · DOI
This study compared how quickly people with ME/CFS and depression could complete two drawing tasks—one simple and one complex. Both patient groups worked more slowly than healthy people, but the pattern of slowness differed between the two conditions. People with depression were especially slow at simple motor tasks, while both patient groups struggled similarly with the more cognitively demanding task.
ME/CFS and depression share overlapping symptoms, making clinical differentiation challenging. This study directly examines psychomotor performance patterns to clarify how the two conditions differ mechanistically, which could improve diagnostic accuracy and inform treatment strategies tailored to each disorder's specific motor and cognitive deficits.
This cross-sectional study cannot establish causality or explain why these motor differences exist at a neurobiological level. The all-female sample and widespread psychotropic medication use limit generalizability, and the study does not clarify whether psychomotor slowing in CFS is a primary disease feature or secondary to other ME/CFS pathophysiology.
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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