Cited by 527Parkinson's Disease Mechanisms and TreatmentsNeural and Behavioral Psychology StudiesCognitive Functions and Memory

Impaired extra-dimensional shift performance in medicated and unmedicated Parkinson's disease: Evidence for a specific attentional dysfunction

Downes, J.J., Roberts, A.C., Sahakian, B.J., Evenden, J.L., Morris, R.G., Robbins, T.W.·1989·Neuropsychologia

Abstract

Groups of patients with Parkinson's disease, either medicated, or unmedicated and early in the course, together with age- and IQ-matched control subjects were tested in two paradigms measuring different aspects of selective attention. The first set of tests compared visual discrimination learning following intra- and extra-dimensional shifts, using a "total change" design in which each shift was made in the presence of novel exemplars of the compound stimuli used as discriminanda. The second test consisted of a visual search task in which the number of alternatives was varied. The results of the first experiment showed a selective deficit in both groups of Parkinsonian subjects in their ability to perform an extra-dimensional shift. In the visual search task, the patients were less accurate, but responded with equivalent choice reaction times to those of controls. The results are discussed in terms of the nature of the attentional dysfunction that occurs in Parkinson's disease.

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Crossref · 10.1016/0028-3932(89)90128-0

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Authors
Downes, J. J., Roberts, A. C., Sahakian, B. J., Evenden, J. L., Morris, R. G., & Robbins, T. W.
Affiliations
University of Cambridge (GB)
Corresponding author
Robbins, T.W.
Venue
Neuropsychologia
Publisher
Elsevier BV
Published
1989-01
Volume
27
Issue
11-12
Pages
1329-1343
ISSN
0028-3932 (ISSN-L)
OpenAlex
W2062147269
Cited by
527
References
39
Citations by year
2026: 2 · 2025: 4 · 2024: 15 · 2023: 8 · 2022: 10 · 2021: 14 · 2020: 8 · 2019: 9 · 2018: 12 · 2017: 14 · 2016: 16 · 2015: 26 · 2014: 12 · 2013: 18 · 2012: 14
FWCI
4.56
Type
journal article
Language
en
Open access
closed
Locations
  • Neuropsychologia (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Functions and Memory
Keywords
Parkinson's disease, selective attention, attentional dysfunction, visual discrimination learning, visual search, medication effects, early-stage Parkinson's disease, choice reaction time
MeSH terms
Aged, Attention, Drug Therapy, Combination, Female, Form Perception, Humans, Levodopa, Male, Middle Aged, Neuropsychological Tests, Parkinson Disease, Pattern Recognition, Visual, Psychomotor Performance, Reaction Time, Trihexyphenidyl, Neurocognitive Disorders

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