Self-organization of trajectory formation View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-05

AUTHORS

G. C. de Guzman, J. A. S. Kelso, J. J. Buchanan

ABSTRACT

Most studies of movement coordination deal with temporal patterns of synchronization between components, often without regard to the actual amplitudes the components make. When such a system is required to produce a composite action that is spatially constrained, coordination persists, but its stability is modulated by spatial requirements effected, we hypothesize, through the component amplitudes. As shown experimentally in part I, when a redundant three-joint system (wrist, elbow, and shoulder) is required to trace a specified arc in space, the joint angles may be frequency- and phased-locked even as the curvature of the trajectory is manipulated. Transitions between joint coordination patterns occur at a critical curvature, accompanied by a significant reduction in wrist amplitude. Such amplitude reduction is viewed as destabilizing the existing coordinative pattern under current task constraints, thereby forcing the joints into a more stable phase relationship. This paper presents a theoretical analysis of these multijoint patterns and proposes an amplitude mechanism for the transition process. Our model uses three linearly coupled, nonlinear oscillators for the joint angles and reproduces both the observed interjoint coordination and component amplitude effects as well as the resulting trajectories of the end effector. More... »

PAGES

275-284

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s004220050339

DOI

http://dx.doi.org/10.1007/s004220050339

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1048765168

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/9195744


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