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Titolo:
Dimensional constraints on limb movements
Autore:
Newell, KM; Challis, S; Morrison, S;
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 Griffith Univ, Gold Coast, Qld, Australia Griffith Univ Gold Coast Qld Australia Univ, Gold Coast, Qld, Australia
Titolo Testata:
HUMAN MOVEMENT SCIENCE
fascicolo: 2, volume: 19, anno: 2000,
pagine: 175 - 201
SICI:
0167-9457(200007)19:2<175:DCOLM>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTAGONIST MUSCLES; RAPID MOVEMENTS; FREEDOM PROBLEM; COORDINATION; COACTIVATION; COMPLEXITY; GENERATION; REVERSALS; DIRECTION; TREMOR;
Keywords:
motor control; degrees of freedom; random movement;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Newell, KM Penn State Univ, Dept Kinesiol, 146 Recreat Bldg, University Pk, PA 16802 USA Penn State Univ 146 Recreat Bldg University Pk PA USA 16802 USA
Citazione:
K.M. Newell et al., "Dimensional constraints on limb movements", HUMAN MOVE, 19(2), 2000, pp. 175-201

Abstract

The dimensional constraints on limb movements were investigated by asking adult participants to move specific segments of the upper limb (Experiment 1 - index finger(s); Experiment 2 - index finger, hand, lower arm, whole arm) with random frequency and amplitude over 2 min trials. The results showed that the amplitude-frequency characteristics of the random trials were limited to particular ranges within the respective potential workspace and with distributions that were broader than that of preferred oscillatory trials. The approximate entropy and dimension of the joint motion was higher in the random than the preferred conditions, but the random movements were shown to have a relatively low dimension. The irregularity of the random movements was enhanced in the more distal limb segments. The findings reveal that the structural and functional constraints to planar motion at a single joint coalesce to provide a set of relatively low dimensional boundary conditions. The implication is that the control structure induces a more limited reduction in the dimensionality of the active system degrees of freedom than is typically postulated in theories of movement control, (C) 2000 Elsevier Science B.V. All rights reserved. PsycINFO classification, 2330.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 09:15:17