Journal ArticleDOI
Learning a pointing task with a kinematically redundant limb: Emerging synergies and patterns of final position variability
Slobodan Jaric,Mark L. Latash +1 more
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TLDR
Data is interpreted as consequences of the emergence of two synergies: (a) Pointing with a non-redundant set of the elbow and shoulder joints; and (b) keeping wrist position constant, which is based on a structural unit that includes all the major arm joints.About:
This article is published in Human Movement Science.The article was published on 1999-12-01. It has received 37 citations till now. The article focuses on the topics: Body movement.read more
Citations
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Journal ArticleDOI
The bliss (not the problem) of motor abundance (not redundancy).
TL;DR: Large amounts of “good variance”—variance in the space of elements that has no effect on the overall performance—have been documented across a variety of natural actions, which support the view that there is no problem of motor redundancy; there is bliss of motor abundance.
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Structure of motor variability in marginally redundant multifinger force production tasks.
TL;DR: One subject showed different relations between VUN and VCOMP, suggesting that these relations did in fact reflect particular central strategies of solving the tasks, and the UCM method is applicable to force production tasks.
Journal ArticleDOI
Motor Synergies and the Equilibrium-Point Hypothesis
TL;DR: The article offers a way to unite three recent developments in the field of motor control and coordination by introducing the notion of synergies based on the principle of motor abundance, and the uncontrolled manifold hypothesis is described as offering a computational framework to identify and quantify synergies.
Journal ArticleDOI
Structure of joint variability in bimanual pointing tasks
TL;DR: It is concluded that the UCM hypothesis allows quantitative assessment of the degree of stabilization of selected performance variables and provides information on changes in the structure of a multijoint synergy that may not be reflected in its overall performance.
Journal ArticleDOI
Learning a throwing task is associated with differential changes in the use of motor abundance.
TL;DR: Improvement of throwing performance in this experiment was more related to improved stabilization of movement direction and to the hand’s orientation to the target than to movement extent and hand velocity, which are consistent with other studies.
References
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Journal ArticleDOI
Central programming of postural movements: adaptation to altered support-surface configurations.
Fay B. Horak,L. M. Nashner +1 more
TL;DR: Exposing subjects to horizontal surface perturbations while standing on support surfaces intermediate in length between the shortest and longest elicited more complex postural movements and associated muscle activation patterns that resembled ankle and hip strategies combined in different temporal relations.
Journal ArticleDOI
Movement, posture and equilibrium: interaction and coordination
TL;DR: This chapter discusses anticipatory postural adjustments associated with equilibrium maintenance in the context of dual-modular approach to posture versus global approach to equilibrium.
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The uncontrolled manifold concept: identifying control variables for a functional task
John P. Scholz,Gregor Schöner +1 more
TL;DR: An operational meaning to ” controlled” and ”uncontrolled” is given and a method of analysis through which hypotheses about controlled and uncontrolled degrees of freedom can be tested is described, finding that, for the task of sit-to-stand, the position of the center of mass in the sagittal plane was controlled.
Journal ArticleDOI
Accuracy of planar reaching movements. I: Independence of direction and extent variability
TL;DR: In this paper, the authors examined the variability in movement end points in a task in which human subjects reached to targets in different locations on a horizontal surface, and determined whether patterns in the variable errors would reveal the nature and origin of the coordinate system in which the movements were planned.
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The uncontrolled manifold concept: identifying control variables for a functional task
John P. Scholz,Gregor Schöner +1 more