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Titolo:
Visual control of isometric force in Parkinson's disease
Autore:
Vaillancourt, DE; Slifkin, AB; Newell, KM;
Indirizzi:
Penn State Univ, Dept Kinesiol, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 l, University Pk, PA 16802 USA Penn State Univ, Gerontol Ctr, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 r, University Pk, PA 16802 USA Penn State Univ, Dept Biobehav Hlth, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 h, University Pk, PA 16802 USA
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 13, volume: 39, anno: 2001,
pagine: 1410 - 1418
SICI:
0028-3932(2001)39:13<1410:VCOIFI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
MUSCLE VIBRATION; MOVEMENT CONTROL; WORKING-MEMORY; BRADYKINESIA; EXECUTION; OBJECTS; GRIP;
Keywords:
force; vision; memory; basal ganglia; Parkinson's disease;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Vaillancourt, DE Univ Illinois, Sch Kinesiol, MC 194,901 W Roosevelt Rd, Chicago, IL 60608 USA Univ Illinois MC 194,901 W Roosevelt Rd Chicago IL USA60608
Citazione:
D.E. Vaillancourt et al., "Visual control of isometric force in Parkinson's disease", NEUROPSYCHO, 39(13), 2001, pp. 1410-1418

Abstract

The current article reports an investigation of the influence of visual feedback on force production in Parkinson's disease (PD) that required subjects to maintain a constant amount of isometric force with their index fingerand thumb with and without visual feedback. Eight PD and eight matched control subjects produced force at 5, 25 and 50% of their maximal voluntary contraction for 20 s. In conditions of full vision, the force trajectory and force target were viewed on the computer monitor. In the no visual feedbackcondition, visual feedback of the force trajectory vanished after the initial 8 s of the trial. The results showed that under the vision condition PDsubjects produced levels of maximal and submaximal force that were similarto controls. Approximately 1.5-2.5 s following the removal of visual feedback, the force level in both subject groups decreased to steady-state levels. There was no difference in the time between visual feedback removal and the beginning of force decay in PD. There was a larger amount and faster rate of force decay after visual feedback removal in PD subjects compared to the controls. It is proposed that the increased force decay in PD does not result from sensory reflex deficits but from higher order sensory-motor memory processes. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 23:52:56