Togo, Fumiharu, Lange, Gudrun, Natelson, Benjamin H et al. · Journal of neuropsychology · 2015 · DOI
This study tested whether a computer-based attention test called the Attention Network Task (ANT) could measure thinking and processing speed problems in ME/CFS patients. Researchers compared 41 ME/CFS patients (some with depression, some without) to 29 healthy controls and found that ME/CFS patients took longer to respond to tasks, especially when the tasks were complex, even though they made the same number of mistakes as controls. This suggests that slowed thinking speed, rather than errors, may be the main cognitive problem in ME/CFS.
Many ME/CFS patients report significant cognitive difficulties ('brain fog'), but these complaints have been difficult to measure objectively in clinical settings. This study provides evidence that the ANT could serve as a validated tool for detecting and monitoring information processing speed deficits in ME/CFS, potentially improving clinical assessment and helping distinguish ME/CFS-related cognitive problems from other conditions. Understanding that speed—not accuracy—is the issue may also guide patient management and expectations.
This study does not establish the biological cause of slowed processing in ME/CFS or prove that the ANT deficits are specific to ME/CFS rather than other fatiguing illnesses. It also does not determine whether processing speed improvements with treatment would occur or whether baseline ANT performance predicts clinical outcomes. The findings are correlational and cannot establish whether processing speed deficits cause other ME/CFS symptoms or vice versa.
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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