Figure 2.

Compensation of time-dependent forces. (a) Average (±SD) baseline hand trajectories before exposure to the time-dependent field (n = 21). (b) Average hand trajectories during the unexpected first exposure to the force field (n = 3). (c) Average hand trajectories in the time-dependent force field after three training sets (n = 21). (d) Average (±SD) aftereffects during the unexpected removal of the force field after three training sets (n = 3). The aftereffects shown in d are mirror images of the initial exposure trajectories shown in b. These results are consistent across all subjects.