Attention deficit

Attention deficit/inability to concentrate

Prevalence

 * 93.0% - 95.9% of the 2073 patients in a Belgian study of 2001 reported attention deficit.
 * Katrina Berne reports a prevalence of 70-100% for concentration/attention deficit.

Symptom recognition

 * In the Canadian Consensus Criteria, impairment of concentration and short-term memory consolidation is an optional criteria for diagnosis, under the section Neurological/Cognitive Manifestations.
 * In the Fukuda criteria, the symptom of substantial impairment in concentration can be used to help form a diagnosis.

Notable studies

 * 2006, Cognitive dysfunction relates to subjective report of mental fatigue in patients with chronic fatigue syndrome"'CFS patients with significant complaints of mental fatigue (score of mental fatigue 2 standard deviations above the mean of nonfatigued subjects) exhibited significant impairment in the spatial working memory and sustained attention (rapid visual information processing) tasks when compared to CFS patients with low complaints of mental fatigue and nonfatigued subjects. In CFS patients with significant mental fatigue, sustained attention performance was impaired only in the final stages of the test, indicating greater cognitive fatigability in these patients.'"