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Muscle activity. A, Average activity for deltoid for one recording session. The solid line indicates activity for movements toward the right target, and the dotted line indicates activity for movements toward the left target. B, Pectoralis activity showing large leftward response. C–F, Activity of ECR, FCR, biceps, and triceps showing activity for preferred and nonpreferred directions. The solid and dotted boxes above each plot indicate the movement direction.
