title: Manipulation of working memory information is impaired in Parkinson's disease and related to working memory capacity.
abstract: It has been suggested that in patients with Parkinson's disease (PD), difficulties in the manipulation of information, which result in problems in executive tasks, are related to a reduction of working memory capacity (J. D. E. Gabrieli, J. Singh, G. T. Stebbins, & C. G. Goetz, 1996). The present study selectively varied the manipulation demand irrespective of the maintenance requirement. In a group of 14 PD patients, performance declined overproportionally with the increasing task demand and was significantly correlated with a measure of working memory capacity. These results suggest that the complexity of working memory processing may decisively contribute to the exhaustion of resources in PD patients. Increasing complexity may either affect their manipulation ability directly or impede the management of inhibitory control requirements inherent to the task.
authors.affiliation: Department of Neurology, Max Planck Institute of Cognitive Neuroscience, Leipzig, Germany. peter.bublak@ku-eichstaett.de
authors.forename: P
authors.initials: P
authors.lastname: Bublak
authors.forename: U
authors.initials: U
authors.lastname: Müller
authors.forename: G
authors.initials: G
authors.lastname: Grön
authors.forename: M
authors.initials: M
authors.lastname: Reuter
authors.forename: D Y
authors.initials: DY
authors.lastname: von Cramon
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008569:Memory Disorders / Q000175:diagnosis / Q000209:etiology*; D008875:Middle Aged; D009483:Neuropsychological Tests; D010300:Parkinson Disease / Q000150:complications*; D011930:Reaction Time; D012720:Severity of Illness Index