Fig. 6.

Generalization does not occur when the EMG rotations at one arm configuration do not match the rotations that are required for movements in another arm configuration. A, Performance of subjects that trained in B₃at Left and were tested in B₃ at Right (mean ± SE; bin size = 64 movements) is shown. The field was configuration independent in hand-centered coordinates but not joint coordinates. Subjects performed significantly worse than did naive controls. B, Rotations with respect to the null field in the preferred direction of EMG tuning functions during learning of B₃at Left and testing in field B₃ at Right are shown. The rotations at Left are opposite the rotations required to move in the same hand-centered field at Right. When the relative change in EMG PD angles rotates with arm configuration, training does not generalize. C, Subjects that learned fieldB₃ at Right were also significantly worse than control subjects in their test of generalization at Left.Disp., Displacement.