Wearden, A, Appleby, L · Psychological medicine · 1997 · DOI
This study asked people with ME/CFS about memory and concentration problems and then tested them in the lab. While ME/CFS patients reported more trouble concentrating and remembering when reading compared to healthy people, standard lab tests didn't always show measurable differences—except in those with depression. This suggests that cognitive difficulties in ME/CFS may be real but show up more in everyday activities than in controlled lab settings.
This research addresses the frustrating discrepancy many ME/CFS patients experience—feeling cognitively impaired while standard medical tests appear normal. By distinguishing between subjective complaints and objective deficits, the study helps validate patient experiences while also identifying that depression may be a key factor in cognitive complaints. Understanding this relationship is important for developing appropriate treatments and avoiding dismissal of patient concerns.
This study does not prove that cognitive complaints are purely psychological or 'all in the head.' It does not establish whether cognitive deficits exist in real-world, physically demanding situations (the study used simplified lab tasks). The correlation between complaint severity and depressed mood does not prove mood causes the complaints—both could result from underlying ME/CFS pathology.
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
Wearden, A & Appleby, L (1997). Cognitive performance and complaints of cognitive impairment in chronic fatigue syndrome (CFS).. Psychological medicine. https://doi.org/10.1017/s0033291796004035
BibTeX
@article{mecfsatlas-wearden-1997-cognitive-performance,
author = {Wearden, A and Appleby, L},
title = {Cognitive performance and complaints of cognitive impairment in chronic fatigue syndrome (CFS).},
journal = {Psychological medicine},
year = {1997},
doi = {10.1017/s0033291796004035},
note = {PubMed: 9122311},
url = {https://www.mecfsatlas.com/evidence/wearden-1997-cognitive-performance},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/wearden-1997-cognitive-performance
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