Cognitive performance and complaints of cognitive impairment in chronic fatigue syndrome (CFS).

Observed Findings

• CFS patients reported significantly more concentration problems and reading difficulties than healthy controls, including more frequent need to re-read text.
• Only depressed CFS patients showed significantly reduced text recall compared to controls; non-depressed CFS patients performed similarly to controls on this task.
• Severity of cognitive complaints correlated with severity of depressed mood, not with actual performance on recall tasks.
• CFS patients accurately assessed their own memory ability immediately after reading, suggesting intact metacognitive awareness.
• No significant differences were found between groups on paired-associate learning tasks.

Inferred Conclusions

• Cognitive deficits in CFS are context-dependent and may be more apparent during naturalistic, real-world tasks than in standardized lab testing.
• Depression is a significant mediator of cognitive complaints in CFS, even though complaints may originate from other sources.
• Subjective cognitive complaints in CFS cannot be simply dismissed as non-organic, as they reflect genuine difficulties with complex reading tasks despite preserved performance on simpler memory tests.
• Cognitive dysfunction in CFS may involve specific difficulties with sustained attention during meaningful tasks rather than global memory or learning impairment.

Remaining Questions