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The impact of irrelevant dimensional variation on rule-based category learning in patients with Parkinson's disease

Published online by Cambridge University Press:  26 August 2005

J. VINCENT FILOTEO ,
W. TODD MADDOX ,
A. DAVID ING ,
VANESSA ZIZAK  and
DAVID D. SONG
J. VINCENT FILOTEO
Affiliation:
Department of Psychology, University of California, San Diego Veterans Administration San Diego Healthcare System, San Diego, California
W. TODD MADDOX
Affiliation:
Department of Psychology, University of Texas, Austin, Texas
A. DAVID ING
Affiliation:
Department of Psychology, University of Texas, Austin, Texas
VANESSA ZIZAK
Affiliation:
Department of Psychology, University of California, San Diego Veterans Administration San Diego Healthcare System, San Diego, California
DAVID D. SONG
Affiliation:
Department of Psychology, University of California, San Diego Veterans Administration San Diego Healthcare System, San Diego, California
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Abstract

This study examined the impact of irrelevant dimensional variation on rule-based category learning in patients with Parkinson's disease (PD), older controls (OC), and younger controls (YC). Participants were presented with 4-dimensional, binary-valued stimuli and were asked to categorize each into 1 of 2 categories. Category membership was based on the value of a single dimension. Four experimental conditions were administered in which there were zero, 1, 2, or 3 randomly varying irrelevant dimensions. Results indicated that patients with PD were impacted to a greater extent than both the OC and YC participants when the number of randomly varying irrelevant dimensions increased. These results suggest that the degree of working memory and selective attention requirements of a categorization task will impact whether PD patients are impaired in rule-based category learning, and help to clarify recent discrepancies in the literature. (JINS, 2005, 11, 503–513.)

Keywords

Basal gangliaStriatumConcept learningMemoryAgingSelective attention
Type
Research Article
Information
Journal of the International Neuropsychological Society , Volume 11 , Issue 5 , September 2005 , pp. 503 - 513
Copyright
© 2005 The International Neuropsychological Society

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