Cockshell, S J, Mathias, J L · Psychological medicine · 2010 · DOI
This study combined results from 50 research papers to understand how ME/CFS affects thinking and memory. Researchers found that people with ME/CFS have real, measurable problems with attention, memory, and processing speed—essentially, the brain takes longer to handle and organize information. However, other thinking skills like vocabulary, reasoning, and basic motor skills were not affected.
This systematic review provides quantitative evidence that cognitive dysfunction ('brain fog') in ME/CFS is a real, measurable phenomenon rather than psychological or subjective, validating patient experiences. Understanding the specific cognitive domains affected helps guide rehabilitation strategies and informs clinicians about realistic expectations for cognitive demands during treatment.
This meta-analysis does not establish the biological mechanism causing cognitive deficits, nor does it determine whether deficits are caused by the disease itself, deconditioning, sleep disturbance, or other factors. It also cannot prove causality or progression of cognitive problems over time, as it aggregates cross-sectional and varied study designs.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Cockshell, S J & Mathias, J L (2010). Cognitive functioning in chronic fatigue syndrome: a meta-analysis.. Psychological medicine. https://doi.org/10.1017/S0033291709992054
BibTeX
@article{mecfsatlas-cockshell-2010-cognitive-functioning,
author = {Cockshell, S J and Mathias, J L},
title = {Cognitive functioning in chronic fatigue syndrome: a meta-analysis.},
journal = {Psychological medicine},
year = {2010},
doi = {10.1017/S0033291709992054},
note = {PubMed: 20047703},
url = {https://www.mecfsatlas.com/evidence/cockshell-2010-cognitive-functioning},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/cockshell-2010-cognitive-functioning
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