Evidence of Incomplete Motor Programming in Parkinson's Disease

One of the essential questions regarding movement deficits in Parkinson's disease (PD) is whether they stem from impaired selecting and switching among movements, impaired use of predictive information to prepare movement, or impaired execution of movement. PD subjects (n = 9) and age-matched c...

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Bibliographic Details
Published in:Journal of motor behavior 1995-12, Vol.27 (4), p.310-324
Main Author: Jennings, Peggy J.
Format: Article
Language:English
Subjects:
basal ganglia
Biological and medical sciences
choice RT
Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases
Medical sciences
Neurology
Parkinson's disease
sequential movement
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Summary:One of the essential questions regarding movement deficits in Parkinson's disease (PD) is whether they stem from impaired selecting and switching among movements, impaired use of predictive information to prepare movement, or impaired execution of movement. PD subjects (n = 9) and age-matched control subjects (n = 8) performed a cued, sequential-response RT task. The cue provided either no information, accurate information, or inaccurate information about the upcoming response. PD subjects used predictive information to prepare and to switch among movement sequences normally, but second and third key press latencies were prolonged in comparison with the first key press latency. In Experiments 2 and 3, the effects of choice set and sequence length on key press latencies were examined. These results provide evidence that PD subjects initiate movement before the entire response sequence is prepared. PD does not impair motor programming or execution processes themselves but impairs the smooth coordination of those processes.
ISSN:0022-2895
1940-1027
DOI:10.1080/00222895.1995.9941720