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Evolution of muscle tuning curves in stroke subjects. (A) Tuning curves of biceps and anterior deltoid averaged across subjects from post-training tasks of the first (dashed line), ninth (gray line), and last (black line) sessions. Control signals are normalized to the maximum level in both sessions and averaged across trials. (B) Tuning curves averaged across all 4 muscles and subjects over sessions. Tuning depth in all muscles gradually increased over time.
