Hypometria in Parkinson's disease: Automatic versus controlled processing

Objectives: The aim was to investigate whether patients with Parkinson's disease (PD) make movements that are of smaller amplitude when required to attend to a secondary task at the same time as performing a motor task. Methods: Thirteen patients with idiopathic Parkinson's disease (mean a...

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Bibliographic Details
Published in:	Movement disorders Vol. 13; no. 3; pp. 422 - 427
Main Authors:	Oliverira, Rosinda M., Gurd, Jennifer M., Nixon, Phillip, Marshall, John C., Passingham, Richard E.
Format:	Journal Article
Language:	English
Published:	Hoboken Wiley Subscription Services, Inc., A Wiley Company 01-05-1998 Wiley
Subjects:	Aged Akinesia Attention Attention - physiology Biological and medical sciences Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases Female Hand Strength - physiology Humans Male Medical sciences Middle Aged Motor Cortex - physiopathology Motor Skills - physiology Muscle Contraction - physiology Neurology Parkinson Disease - diagnosis Parkinson Disease - physiopathology Parkinson's disease Perceptual Disorders - diagnosis Perceptual Disorders - physiopathology Reaction Time - physiology Speech Perception - physiology Tropical medicine Human Nervous system diseases Akinesia Motor system disorder Parkinson disease Exploration Cerebral disorder Manual task Central nervous system disease Lexical decision Degenerative disease Neurological disorder Extrapyramidal syndrome
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Summary:	Objectives: The aim was to investigate whether patients with Parkinson's disease (PD) make movements that are of smaller amplitude when required to attend to a secondary task at the same time as performing a motor task. Methods: Thirteen patients with idiopathic Parkinson's disease (mean age, 67.1 yrs) and 14 healthy control subjects (mean age, 66.2 yrs) were tested. The motor task was repeated opposition of the thumb and forefinger and the secondary task was a lexical decision task. Results: The PD patients made hypometric movements, and the amplitude was further decreased when they performed the secondary task at the same time. There was no significant change for the control subjects. Conclusion: The unpaced motor task was less automatic for the PD patients than for the control subjects, and hence more subject to interference from a secondary task. We relate this to the underactivation of the supplementary motor cortex (SMA).
Bibliography:	ArticleID:MDS870130309 istex:0393BE1801EEE1228D51298085EDD61AE9378195 ark:/67375/WNG-HG0C265F-6 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0885-3185 1531-8257
DOI:	10.1002/mds.870130309