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Titolo:
Kinematic analysis of effects of task constraints on prehension in ataxic brain-injured subjects
Autore:
Bate, PJ; Hoffmann, ER;
Indirizzi:
Univ Melbourne, Dept Mech & Mfg Engn, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 arkville, Vic 3052, Australia
Titolo Testata:
HUMAN MOVEMENT SCIENCE
fascicolo: 2-3, volume: 18, anno: 1999,
pagine: 241 - 262
SICI:
0167-9457(199906)18:2-3<241:KAOEOT>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNCTIONAL-ORGANIZATION; INFERIOR AREA-6; MACAQUE MONKEY; SOMATOTOPY; MOVEMENTS;
Keywords:
ataxia; kinematics; task constraints; motor processes; neurological disorders and brain damage;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Hoffmann, ER Univ Melbourne, Dept Mech & Mfg Engn, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 3052, Australia
Citazione:
P.J. Bate e E.R. Hoffmann, "Kinematic analysis of effects of task constraints on prehension in ataxic brain-injured subjects", HUMAN MOVE, 18(2-3), 1999, pp. 241-262

Abstract

Kinematic descriptors were obtained for effects of object distance and size on performance of prehension by six ataxic patients following traumatic brain injury (TBI) and six matched controls. The Constant Enclosure model ofprehension (Hoff & Arbib, 1991) predicted the movements of both groups, and ataxic movement patterns suggested that the subjects were utilising compensatory strategies to reduce effects of uncontrolled interactive joint torques (Thach, Ferry, Kane & Goodkin, 1993; Bastian, Martin, Keating & Thach, 1996). Changes in task constraints were shown to modify ataxic movements: prolonged durations of transport and grasp phases were reduced in reaches tosmall, dose objects, and the positive skew of velocity profiles was less when the object was close. Discontinuities (Jagacinski, Repperger, Moran, Ward & Glass, 1980) were identified in the wrist trajectories of the ataxic group. The number and duration of these Movement Units (MU) were unaffected by distance or size of the object, but the displacement within MUs was lessin reaches to close objects. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 21/01/20 alle ore 07:07:27