Wearden, A J, Appleby, L · Journal of psychosomatic research · 1996 · DOI
People with ME/CFS often report problems with memory and concentration, but when researchers test their cognitive abilities in the lab, they don't find major deficits. This review suggests the gap between what patients experience and what tests show might be because lab tests don't measure 'real-world' thinking very well. In ME/CFS, everyday mental tasks may be using up so much energy that patients have less mental flexibility left over for other things.
This study is important because it validates a common patient experience—that cognitive symptoms feel very real despite normal test results—and suggests this isn't unique to ME/CFS or necessarily evidence of malingering. Understanding that cognitive difficulties may reflect resource depletion rather than actual damage helps reframe the symptom and may guide better rehabilitation strategies.
This review does not prove that cognitive complaints are purely psychological or that they result from depression alone. It does not establish the specific mechanisms causing the complaint-performance gap, nor does it prove that standard lab tests are inadequate for all types of cognitive assessment in CFS. As a review article, it synthesizes existing evidence rather than providing new empirical data.
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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