Mahurin, Roderick K, Claypoole, Keith H, Goldberg, Jack H et al. · Neuropsychology · 2004 · DOI
This study tested thinking and processing speed in identical twins where one had ME/CFS and one didn't, compared to healthy people without the condition. Researchers found that both twin groups—even the healthy ones—were slower at tasks requiring quick thinking compared to unrelated healthy controls, but both groups performed equally well on untimed thinking tasks. This suggests that slower processing speed may run in families rather than being caused by ME/CFS itself.
This study provides evidence that some cognitive difficulties in ME/CFS may reflect inherited genetic factors rather than disease-caused damage, which has implications for understanding vulnerability to the condition and could inform research into biological mechanisms. For patients, it suggests that processing speed changes may be a pre-existing trait rather than solely a symptom of their illness.
This study does not prove that genetic factors alone cause ME/CFS or that environmental factors play no role in symptom development. The findings do not establish that slower processing speed is directly inherited; it could reflect unmeasured shared environmental factors. Additionally, because healthy twins with the genetic trait did not develop CFS, this study cannot identify what additional factors trigger disease manifestation in some genetically susceptible individuals.
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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