Cognitive dysfunction in adolescents with chronic fatigue: a cross-sectional study.
Sulheim, Dag, Fagermoen, Even, Sivertsen, Øyvind Stople et al. · Archives of disease in childhood · 2015 · DOI
Quick Summary
This study compared thinking and memory skills in teenagers with chronic fatigue to healthy teenagers. Teenagers with chronic fatigue performed worse on tests of processing speed (how fast they could think), working memory (holding information in mind), and learning new information. These differences were not explained by depression, anxiety, or sleep problems alone.
Why It Matters
Cognitive dysfunction is a core feature of ME/CFS that substantially impacts school performance and quality of life in adolescents, yet remains underrecognized clinically. This study provides objective neurocognitive evidence that such deficits are measurable and clinically relevant, supporting the need for formal cognitive assessment and accommodations in educational and clinical settings for affected youth.
Observed Findings
Processing speed was 3.3 points lower in the chronic fatigue group (p=0.003)
Working memory was 2.4 points lower in the chronic fatigue group (p<0.001)
Cognitive inhibition response time was 6.2 points slower in the chronic fatigue group (p=0.025)
Verbal learning scores were 1.7 points lower in the chronic fatigue group (p=0.022)
Parent-rated everyday executive function (BRIEF) was 11.2 points worse in the chronic fatigue group (p<0.001)
Inferred Conclusions
Adolescents with chronic fatigue show clinically relevant objective cognitive impairment compared to healthy peers
Working memory and processing speed appear to be core cognitive difficulties in adolescent chronic fatigue
Cognitive deficits are not primarily attributable to comorbid depression, anxiety, or sleep disturbance
Everyday executive function impairments extend beyond formal testing into real-world functioning
Remaining Questions
Is cognitive dysfunction a primary feature of ME/CFS or secondary to other physiological mechanisms (immune activation, metabolism, mitochondrial function)?
What This Study Does Not Prove
This cross-sectional design cannot establish whether cognitive impairment is a cause or consequence of chronic fatigue, or whether it is specific to ME/CFS versus other conditions causing chronic fatigue. The study does not clarify the underlying mechanisms (neuroinflammation, metabolic dysfunction, etc.) driving cognitive dysfunction. Findings may not generalize beyond Scandinavian adolescent populations.
Tags
Symptom:Cognitive DysfunctionFatigue
Phenotype:Pediatric
Method Flag:PEM Not DefinedWeak Case DefinitionSmall Sample
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 →