NDLI: Stabilization of kinematic variables in the control of bimanual pointing movements

Content Provider	IEEE Xplore Digital Library
Author	Laczko, J. Jaric, S. Domkin, D. Johansson, H. Latash, M.L.
Copyright Year	2001
Description	Author affiliation: Dept. of Biomech., Semmelweis Univ., Budapest, Hungary (Laczko, J.)
Abstract	Human voluntary movements face a problem of kinematic redundancy. We study a planar bimanual task, when one hand moves a target and the other hand moves a pointer that must reach the target. We hypothesized that the stabilized task variable was the vectorial difference of the pointer tip and the target. The 6D state space was defined by "joint configuration vectors" whose elements were intersegmental joint angles. The subjects repeated the movements 15 times, and the movements were recorded by a movement analysis system. Then, the subjects practised the movements (300 trials). After practice 15 trials were recorded again. We computed the variance of the joint configurations before and after practice. Six joint rotations affected the 2D task variable. The uncontrolled manifold (UCM) corresponding to this variable is 4D, while the subspace of the state space that is orthogonal (ORT) to the UCM is 2D. The variance within the UCM was larger than in the ORT conforming to the UCM hypothesis. After practice the joint variance decreased and the drop in the component of variance that did not affect the task variable was larger than the drop of the other component. Thus, practice lead to more stable time courses of the task variable and of the corresponding joint configuration.
Sponsorship	Int. Neural Network Soc.
Starting Page	1256
Ending Page	1260
File Size	420948
Page Count	5
File Format	PDF
ISBN	0780370449
ISSN	10987576
DOI	10.1109/IJCNN.2001.939541
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Kinematics State-space methods Shoulder Physics Biological materials Humans Face H infinity control Central nervous system Elbow
Content Type	Text
Resource Type	Article

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