Parkinsonian arm movements as altered by task difficulty
Identifieur interne : 002083 ( Main/Exploration ); précédent : 002082; suivant : 002084Parkinsonian arm movements as altered by task difficulty
Auteurs : P. Weiss [États-Unis, Allemagne] ; G. E. Stelmach [États-Unis] ; C. H. Adler [États-Unis] ; C. Waterman [États-Unis]Source :
- Parkinsonism and Related Disorders [ 1353-8020 ] ; 1996.
Abstract
A discrete elbow movement to targets with different indexes of difficulty (ID) was used to determine the kinematic organization of arm movements in a young, an elderly and a Parkinson's disease (PD) group (n = 14). Target size and movement amplitude changes led to expected modifications of the kinematics in all three groups according to Fitts' law. Increased task demands by changing target size produced not only differences between the age-groups, but affected the modulation of velocity and acceleration in the parkinsonian patients differentially. For large amplitude movements, the PD patients were less able to increase velocity and acceleration magnitudes when target accuracy constraints were reduced. These findings, when taken together with the observation that speed scaling was preserved for small movement amplitudes, suggest that a reduced capability to initiate and regulate force is the cause for the observed slowness in PD.
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DOI: 10.1016/S1353-8020(96)00026-0
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Waterman</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:7E8D94B39D127E3C51F17CCDF48AD1DDCEF8F955</idno><date when="1996" year="1996">1996</date><idno type="doi">10.1016/S1353-8020(96)00026-0</idno><idno type="url">https://api.istex.fr/document/7E8D94B39D127E3C51F17CCDF48AD1DDCEF8F955/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">002960</idno><idno type="wicri:Area/Main/Curation">002608</idno><idno type="wicri:Area/Main/Exploration">002083</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Parkinsonian arm movements as altered by task difficulty</title><author><name sortKey="Weiss, P" sort="Weiss, P" uniqKey="Weiss P" first="P." last="Weiss">P. Weiss</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Neurology, Mayo Clinic, Scottsdale, AZ 85259</wicri:regionArea><placeName><region type="state">Arizona</region></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>★ Current address: Department of Neurology, Heinrich-Heine-University, Moorenstr. 5, D-40225 Düsseldorf</wicri:regionArea><wicri:noRegion>40225 Düsseldorf</wicri:noRegion><wicri:noRegion>D-40225 Düsseldorf</wicri:noRegion></affiliation></author><author><name sortKey="Stelmach, G E" sort="Stelmach, G E" uniqKey="Stelmach G" first="G. E." last="Stelmach">G. E. 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Target size and movement amplitude changes led to expected modifications of the kinematics in all three groups according to Fitts' law. Increased task demands by changing target size produced not only differences between the age-groups, but affected the modulation of velocity and acceleration in the parkinsonian patients differentially. For large amplitude movements, the PD patients were less able to increase velocity and acceleration magnitudes when target accuracy constraints were reduced. These findings, when taken together with the observation that speed scaling was preserved for small movement amplitudes, suggest that a reduced capability to initiate and regulate force is the cause for the observed slowness in PD.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>États-Unis</li></country><region><li>Arizona</li></region></list><tree><country name="États-Unis"><region name="Arizona"><name sortKey="Weiss, P" sort="Weiss, P" uniqKey="Weiss P" first="P." last="Weiss">P. Weiss</name></region><name sortKey="Adler, C H" sort="Adler, C H" uniqKey="Adler C" first="C. H." last="Adler">C. H. Adler</name><name sortKey="Stelmach, G E" sort="Stelmach, G E" uniqKey="Stelmach G" first="G. E." last="Stelmach">G. E. Stelmach</name><name sortKey="Waterman, C" sort="Waterman, C" uniqKey="Waterman C" first="C." last="Waterman">C. Waterman</name></country><country name="Allemagne"><noRegion><name sortKey="Weiss, P" sort="Weiss, P" uniqKey="Weiss P" first="P." last="Weiss">P. Weiss</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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