title: Cognitive dysfunction in obsessive-compulsive disorder.
abstract: OBJECTIVE
  Assessment of cognitive functions among obsessive-compulsive disorder (OCD) patients would help in understanding the neurobiology and brain areas involved in that disorder. The objective of this work was to study the cognitive dysfunction in OCD patients and to identify its correlation with both the clinical picture and the severity of the disorder.
  
  
  METHODS
  Neuropsychological and electrophysiological event-related potentials were tested in 30 OCD patients and compared with 30 normal volunteers of a matched gender, age and education.
  
  
  RESULTS
  Results showed a defective visuospatial recognition, which worsens with chronicity, deteriorated set-shifting abilities, overfocused attention to irrelevant stimuli and delayed selective attention to relevant tasks. Mild cases showed better selective attention than severe cases. Obsessive cases had a defective visual memory, while compulsive cases had delayed perception of task relevant stimuli. Mixed cases showed disturbed information-processing both early and late.
  
  
  CONCLUSIONS
  OCD patients have a characteristic pattern of cognitive dysfunction that differs among patients of varied severity, chronicity and symptom type. We suggest a striatofrontoparietal neural pathophysiology. OCD seems to be a heterogeneous disorder, both clinically and pathophysiologically.
authors.affiliation: Institute of Psychiatry, Ain Shams University, Egypt.
authors.forename: A
authors.initials: A
authors.lastname: Okasha
authors.forename: M
authors.initials: M
authors.lastname: Rafaat
authors.forename: N
authors.initials: N
authors.lastname: Mahallawy
authors.forename: G
authors.initials: G
authors.lastname: El Nahas
authors.forename: A S
authors.initials: AS
authors.lastname: El Dawla
authors.forename: M
authors.initials: M
authors.lastname: Sayed
authors.forename: S
authors.initials: S
authors.lastname: El Kholi
mesh_terms: D000293:Adolescent; D000328:Adult; D001288:Attention / Q000502:physiology; D002908:Chronic Disease; D003072:Cognition Disorders / Q000150:complications* / Q000175:diagnosis*; D003342:Corpus Striatum / Q000503:physiopathology; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D009771:Obsessive-Compulsive Disorder / Q000150:complications* / Q000503:physiopathology; D010296:Parietal Lobe / Q000503:physiopathology; D010468:Perceptual Disorders / Q000175:diagnosis; D012720:Severity of Illness Index; D013028:Space Perception / Q000502:physiology; D014796:Visual Perception / Q000502:physiology