Figure 4 Average spectral power of the force signal for the 25%‐maximum voluntary contraction (MVC; top panels) and 50%‐MVC force target (bottom panels) under conditions of vision (left panels) and no vision (right panels) in the 0–4‐Hz, 4–8‐Hz and 8–12‐Hz frequency bins. Controls are shown as black lines and diamonds and patients with dystonia as grey lines and squares. Values are mean (SE). The scale of the y axis is different at the different force targets.