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Power spectrum from the total force for a control (black line) and a patient with dystonia (grey line) at the 50%-maximum voluntary contraction (MVC) force level. (B) Modal force frequency for each control (black circles) and patient (grey squares) at the 50%-MVC force level with vision. (C) Modal force frequency for each control (black circles) and patient (grey squares) at the 50%-MVC force level without vision.
