Figure 3. Rotation Learning at the Wrist Is Not Interfered With by Counter-Rotation Learning at the Arm.

(A) R_wrist on day 2, after R_wrist followed by CR_arm 5 min later on day 1 (group 7, white squares, dashed curve). There was savings from R_wrist on day 1 to R_wrist on day 2 despite CR_arm. The thick black curve represents R_wrist on day 1 (group 1).

(B) Bar graph showing a statistically significant difference in the reduction in mean directional error in the first six cycles for R_wrist on day 1 versus day 2 (groups 1 and 7, mean difference = 6.49°, p =0.0036). This difference was absent when only CR_arm was learned on day 1, with no statistically significant difference in the reduction in mean directional error in the first six cycles for day 1 versus day 2 (groups 1 and 8, mean difference = 0.328°, p = 0.88).