Fig. 3.

Electromyographic (EMG) activity in the nonperforming hand. A: example EMG traces during the rest period (between movement blocks of 4 trials) and task period for the performing and nonperforming hands. Performing hand activity was recorded but not analyzed for differences across blocks due to scanner artifacts related to changing hand position that could not be reliably corrected. B: mean EMG activity in the nonperforming hand as a function of nonperforming hand (right or left) and movement in the performing hand [i.e., to extra-large (XL), large (L), medium (M), or small (S) targets, or during rest].