TY  - JOUR
PY  - 1998//
TI  - Geometric features of workspace and joint-space paths of 3D reaching movements
JO  - Acta psychologica
A1  - Klein Breteler, M. D.
A1  - Meulenbroek, R. G.
A1  - Gielen, S. C.
SP  - 37
EP  - 53
VL  - 100
IS  - 1-2
N2  - The present study focuses on geometric features of workspace and joint-space paths of three-dimensional reaching movements. Twelve subjects repeatedly performed a three-segment, triangular-shaped movement pattern in an approximately 60 degrees tilted horizontal plane. Task variables elicited movement patterns that varied in position, rotational direction and speed. Trunk, arm, hand and finger-tip movements were recorded by means of a 3D motion-tracking system. Angular excursions of the shoulder and elbow joints were extracted from position data. Analyses of the shape of 3D workspace and joint-space paths focused on the extent to which the submovements were produced in a plane, and on the curvature of the central parts of the submovements. A systematic tendency to produce movements in a plane was found in addition to an increase of finger-tip path curvature with increasing speed. The findings are discussed in relation to the role of optimization principles in trajectory-formation models.<p /> <p>Language: en</p>
LA  - en
SN  - 0001-6918
UR  - http://dx.doi.org/
ID  - ref1
ER  -