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2012 | 34 | 1 | 5-13
Tytuł artykułu

Movements that are both variable and optimal

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
This brief review addresses two major aspects of the neural control of multi-element systems. First, the principle of abundance suggests that the central nervous system unites elements into synergies (co-variation of elemental variables across trials quantified within the framework of the uncontrolled manifold hypothesis) that stabilize important performance variables. Second, a novel method, analytical inverse optimization, has been introduced to compute cost functions that define averaged across trials involvement of individual elements over a range of values of task-specific performance variables. The two aspects reflect two features of motor coordination: (1) using variable solutions that allow performing secondary tasks and stabilizing performance variables; and (2) selecting combinations of elemental variables that follow an optimization principle. We suggest that the conflict between the two approaches (a single solution vs. families of solutions) is apparent, not real. Natural motor variability may be due to using the same cost function across slightly different initial states; on the other hand, there may be variability in the cost function itself leading to variable solutions that are all optimal with respect to slightly different cost functions. The analysis of motor synergies has revealed specific changes associated with atypical development, healthy aging, neurological disorders, and practice. These have allowed formulating hypotheses on the neurophysiological mechanisms involved in the synergic control of actions.
Słowa kluczowe
Wydawca

Rocznik
Tom
34
Numer
1
Strony
5-13
Opis fizyczny
Daty
wydano
2012-10-01
online
2012-10-23
Twórcy
Bibliografia
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  • Niu X, Latash ML, Zatsiorsky VM. Reproducibility and variability of the cost functions reconstructed from experimental recordings in multi-finger prehension. J Mot Behav, 2012; 44: 69-85[WoS]
  • Olafsdottir H, Yoshida N, Zatsiorsky VM, Latash ML. Anticipatory covariation of finger forces during selfpaced and reaction time force production. Neurosci Lett, 2005; 381: 92-96
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  • Shim JK, Kim SW, Oh SJ, Kang N, Zatsiorsky VM, Latash ML. Plastic changes in interhemispheric inhibition with practice of a two-hand force production task: A transcranial magnetic stimulation study. Neurosci Lett, 2005a; 374: 104-108.
  • Shim JK, Olafsdottir H, Zatsiorsky VM, Latash ML. The emergence and disappearance of multi-digit synergies during force production tasks. Exp Brain Res, 2005b, 164: 260-270
  • Shim JK, Park J, Zatsiorsky VM, Latash ML. Adjustments of prehension synergies in response to self-triggered and experimenter-triggered load and torque perturbations. Exp Brain Res, 2006; 175: 641-653
  • Shinohara M, Scholz JP, Zatsiorsky VM, Latash ML. Finger interaction during accurate multi-finger force production tasks in young and elderly persons. Exp Brain Res, 2004; 156: 282-292
  • Terekhov AV, Pesin YB, Niu X, Latash ML, Zatsiorsky VM. An analytical approach to the problem of inverse optimization: An application to human prehension. J Math Biol, 2010; 61: 423-453[WoS]
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  • Zhang W, Scholz JP, Zatsiorsky VM, Latash ML. What do synergies do? Effects of secondary constraints on multi-digit synergies in accurate force-production tasks. J Neurophysiol, 2008; 99: 500-513[WoS]
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_v10078-012-0058-9
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