Article Figures & Data
Figures
- Fig. 1.
Motion paths and associated forces and torques for movements at the left and right of the workspace. A andC show movement directions used in training trials.B and D show movement directions in transfer trials. 1 and 2 refer to experiments 1 and 2. In A and C,j and h denote training directions that have the same joint or hand paths as the directions tested in the transfer trials shown in B and D.
- Fig. 2.
Transfer of learning between workspace locations is observed for movements involving the same joint displacements. No transfer is observed when movements in different locations are matched in terms of hand displacement. A and Bgive results for single subjects in experiments 1 and 2. In each case, training trials at the left of the workspace and transfer trials at the right are shown.
- Fig. 3.
A, Mean values across subjects (experiment 1) of kinematic error for the first and last training trials and for the transfer trials. Error bars denote ±1 SE.Gray bars are for group h; white bars are for group j. B, Mean values across subjects for each of the 20 trials in the first and last training sets and the transfer set. In both panels transfer is observed when movements involve the same joint displacements.
- Fig. 4.
Asymmetries in the effect of the force field are observed for movements in different directions. Shown are movement paths for center-out movements in which a clockwise or counterclockwise curl field is unexpectedly introduced. The effects at the left and right of the workspace are similar once they are corrected for the angle at the shoulder.
