Examining procedural working memory processing in obsessive-compulsive disorder

Nitzan Shahar, Andrei R. Teodorescu, Gideon E. Anholt, Anat Karmon-Presser, Nachshon Meiran

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Previous research has suggested that a deficit in working memory might underlie the difficulty of obsessive-compulsive disorder (OCD) patients to control their thoughts and actions. However, a recent meta-analyses found only small effect sizes for working memory deficits in OCD. Recently, a distinction has been made between declarative and procedural working memory. Working memory in OCD was tested mostly using declarative measurements. However, OCD symptoms typically concerns actions, making procedural working-memory more relevant. Here, we tested the operation of procedural working memory in OCD. Participants with OCD and healthy controls performed a battery of choice reaction tasks under high and low procedural working memory demands. Reaction-times (RT) were estimated using ex-Gaussian distribution fitting, revealing no group differences in the size of the RT distribution tail (i.e., τ parameter), known to be sensitive to procedural working memory manipulations. Group differences, unrelated to working memory manipulations, were found in the leading-edge of the RT distribution and analyzed using a two-stage evidence accumulation model. Modeling results suggested that perceptual difficulties might underlie the current group differences. In conclusion, our results suggest that procedural working-memory processing is most likely intact in OCD, and raise a novel, yet untested assumption regarding perceptual deficits in OCD.

Original languageEnglish
Pages (from-to)197-204
Number of pages8
JournalPsychiatry Research
Volume253
DOIs
StatePublished - 1 Jul 2017

Keywords

  • Evidence accumulation modeling
  • Ex-Gaussian distribution
  • Executive functions
  • Intra-individual variability
  • Obsessive compulsive disorder
  • Working memory

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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