TY - JOUR
T1 - The effects of practice on movement distance and final position reproduction
T2 - implications for the equilibrium-point control of movements
AU - Jaric, Slobodan
AU - Corcos, Daniel M.
AU - Gottlieb, Gerald L.
AU - Ilic, Dusko B.
AU - Latash, Mark L.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1994/8
Y1 - 1994/8
N2 - Predictions of two views on single-joint motor control, namely programming of muscle force patterns and equilibrium-point control, were compared with the results of experiments with reproduction of movement distance and final location during fast unidirectional elbow flexions. Two groups of subjects were tested. The first group practiced movements over a fixed distance (36°), starting from seven different initial positions (distance group, DG). The second group practiced movements from the same seven initial positions to a fixed final location (location group, LG). Later, all the subjects were tested at the practiced task with their eyes closed, and then, unexpectedly for the subjects, they were tested at the other, unpracticed task. In both groups, the task to reproduce final position had lower indices of final position variability than the task to reproduce movement distance. Analysis of the linear regression lines between initial position and final position (or movement distance) also demonstrated a better (more accurate) performance during final position reproduction than during distance reproduction. The data are in a good correspondence with the predictions of the equilibrium-point hypothesis, but not with the predictions of the force-pattern control approach.
AB - Predictions of two views on single-joint motor control, namely programming of muscle force patterns and equilibrium-point control, were compared with the results of experiments with reproduction of movement distance and final location during fast unidirectional elbow flexions. Two groups of subjects were tested. The first group practiced movements over a fixed distance (36°), starting from seven different initial positions (distance group, DG). The second group practiced movements from the same seven initial positions to a fixed final location (location group, LG). Later, all the subjects were tested at the practiced task with their eyes closed, and then, unexpectedly for the subjects, they were tested at the other, unpracticed task. In both groups, the task to reproduce final position had lower indices of final position variability than the task to reproduce movement distance. Analysis of the linear regression lines between initial position and final position (or movement distance) also demonstrated a better (more accurate) performance during final position reproduction than during distance reproduction. The data are in a good correspondence with the predictions of the equilibrium-point hypothesis, but not with the predictions of the force-pattern control approach.
UR - http://www.scopus.com/inward/record.url?scp=0027933601&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027933601&partnerID=8YFLogxK
U2 - 10.1007/BF00227205
DO - 10.1007/BF00227205
M3 - Article
C2 - 7813672
AN - SCOPUS:0027933601
SN - 0014-4819
VL - 100
SP - 353
EP - 359
JO - Experimental Brain Research
JF - Experimental Brain Research
IS - 2
ER -