title: Performance monitoring in obsessive-compulsive undergraduates: Effects of task difficulty.
abstract: Both obsessive-compulsive disorder and subclinical obsessive-compulsive (OC) symptoms seem to be associated with hyperactive error-related brain activity. The current study examined performance monitoring in subjects with subclinical OC symptoms using a new task with different levels of difficulty. Nineteen subjects with high and 18 subjects with low OC characteristics performed a random dot cinematogram (RDC) task with three levels of difficulty. The high and low OC groups did not differ in error-related negativity (ERN), correct-related negativity (CRN) and performance irrespective of task difficulty. The amplitude of the ERN decreased with increasing difficulty whereas the magnitude of CRN did not vary. ERN and CRN approached in size and topography with increasing difficulty, which suggests that errors and correct responses are processed more similarly. These results add to a growing number of studies that fail to replicate hyperactive performance monitoring in individuals with OC symptoms in task with higher difficulty or requiring learning. Together with these findings our results suggest that the relationship between OC symptoms and performance monitoring may be sensitive to type of task and task characteristics and cannot be observed in a RDC that differs from typically used tasks in difficulty and the amount of response-conflict.
authors.affiliation: Department of Psychology, Humboldt-Universität zu Berlin, Germany. Electronic address: anja.riesel@hu-berlin.de.
authors.forename: Anja
authors.initials: A
authors.lastname: Riesel
authors.affiliation: Department of Psychology, Humboldt-Universität zu Berlin, Germany.
authors.forename: Anika
authors.initials: A
authors.lastname: Richter
authors.affiliation: Department of Psychology, Humboldt-Universität zu Berlin, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Kaufmann
authors.affiliation: Department of Psychology, Humboldt-Universität zu Berlin, Germany.
authors.forename: Norbert
authors.initials: N
authors.lastname: Kathmann
authors.affiliation: Department of Psychology, Humboldt-Universität zu Berlin, Germany; Institute of Psychology, Otto-von-Guericke-Universität Magdeburg, Germany.
authors.forename: Tanja
authors.initials: T
authors.lastname: Endrass
mesh_terms: D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods; D005071:Evoked Potentials / Q000502:physiology*; D056344:Executive Function / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000503:physiopathology*; D011597:Psychomotor Performance / Q000502:physiology*; D055815:Young Adult
keywords: CRN; Difficulty; ERN; Obsessive–compulsive symptoms; Performance monitoring; Task characteristics