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Category Learning Deficits in Parkinson's Disease F. Gregory Ashby and Sharon Noble

Summary: Category Learning Deficits in Parkinson's Disease
F. Gregory Ashby and Sharon Noble
University of California, Santa Barbara
J. Vincent Filoteo
University of California, San Diego, and Veterans
Administration San Diego Healthcare System
Elliott M. Waldron
Sightward Inc.
Shawn W. Ell
University of California, Santa Barbara
Sixteen patients with Parkinson's disease (PD), 15 older controls (OCs), and 109 younger
controls (YCs) were compared in 2 category-learning tasks. Participants attempted to assign
colored geometric figures to 1 of 2 categories. In rule-based tasks, category membership was
defined by an explicit rule that was easy to verbalize, whereas in information-integration
tasks, there was no salient verbal rule and accuracy was maximized only if information from 3
stimulus components was integrated at some predecisional stage. The YCs performed the best
on both tasks. The PD patients were highly impaired compared with the OCs, in the
rule-based categorization task but were not different from the OCs in the information-
integration task. These results support the hypothesis that learning in these 2 tasks is mediated
by functionally separate systems.


Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara


Collections: Biology and Medicine; Computer Technologies and Information Sciences