title: Executive function in Parkinson's disease: contributions of the dorsal frontostriatal pathways to action and motivation.
abstract: Disruption of the dorsal frontostriatal pathways in Parkinson's disease (PD) is associated with impairments in motivation, as well as in executive function. The goal of this study was to investigate whether these impairments are related and, if so, whether the disruption of frontostriatal pathways compromises the ability to process the motivational aspects of feedback in such tasks. In Experiment 1, informative feedback improved the performance of young, healthy participants in a task-switching paradigm. This task-switching paradigm was then used in Experiment 2 to test whether feedback would improve the performance of 17 PD patients and age-matched controls. The PD group benefitted from feedback to the same degree as control participants; however, depression scores on the Beck Depression Inventory were significantly related to feedback usage, especially when response selection demands were high. Regardless of feedback, PD patients were more impaired when response demands were high than in an equally difficult condition with low action demands. These results suggest that response selection is a core impairment of insufficient dopamine to the dorsal frontal striatal pathways.
authors: Department of Psychology, Michigan State University, East Lansing, MI 48824, USA. ravizzas@msu.edu
authors: Susan M
authors: SM
authors: Ravizza
authors: John
authors: J
authors: Goudreau
authors: Mauricio R
authors: MR
authors: Delgado
authors: Sandra
authors: S
authors: Ruiz
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001288:Attention; D003072:Cognition Disorders / Q000209:etiology*; D056344:Executive Function / Q000502:physiology*; D030141:Feedback, Psychological; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009042:Motivation; D009068:Movement / Q000502:physiology*; D009483:Neuropsychological Tests; D010300:Parkinson Disease / Q000150:complications*; D011569:Psychiatric Status Rating Scales; D011930:Reaction Time; D055815:Young Adult