title: Cognitive rigidity in unipolar depression and obsessive compulsive disorder: examination of task switching, Stroop, working memory updating and post-conflict adaptation.
abstract: Obsessive compulsive disorder (OCD) and depressive rumination are both characterized by cognitive rigidity. We examined the performance of 17 patients (9 suffering from unipolar depression [UD] without OCD, and 8 suffering from OCD without UD), and 17 control participants matched on age, gender, language and education, on a battery covering the four main executive functions. Results indicated that, across both disorders, patients required more trials to adjust to single-task conditions after experiencing task switching, reflecting slow disengagement from switching mode, and showed abnormal post-conflict adaptation of processing mode following high conflict Stroop trials in comparison to controls. Rumination, which was elevated in UD and not in OCD, was associated with poor working memory updating and less task preparation. The results show that OCD and UD are associated with similar cognitive rigidity in the presently tested paradigms.
authors.affiliation: Department of Psychology, Ben-Gurion University of the Negev, Beer-Sheva, Israel. nmeiran@bgu.ac.il
authors.forename: Nachshon
authors.initials: N
authors.lastname: Meiran
authors.forename: Gary M
authors.initials: GM
authors.lastname: Diamond
authors.forename: Doron
authors.initials: D
authors.lastname: Toder
authors.forename: Boris
authors.initials: B
authors.lastname: Nemets
mesh_terms: D000223:Adaptation, Psychological; D000328:Adult; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology; D003072:Cognition Disorders / Q000175:diagnosis / Q000209:etiology / Q000523:psychology; D003220:Conflict, Psychological; D003463:Cues; D003866:Depressive Disorder / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology*; D008875:Middle Aged; D009483:Neuropsychological Tests; D009771:Obsessive-Compulsive Disorder / Q000150:complications*; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology