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(A) Single-trial records from one patient with dystonia (grey line) and a matched control (black line) at 50% maximum voluntary contraction (MVC) with vision allowed throughout the trial. (B) Force variability across the group of controls (black bars) and patients with dystonia (grey bars) at 25%-MVC and 50%-MVC force levels with vision. (C) Force variability across the group of controls (black bars) and patients (grey bars) at both force levels without vision. Data are mean (SE).
