Fig 10. Similarities between the agonist muscle activity and wrist position in the step-tracking task.

(A1) Comparison of agonist muscle activity (Agonist activity), displacement (Displ), and tangential velocity (Vel) of the wrist joint for the eight directions for the control subject shown in Fig 4A. Note the similarity of Agonist to Displ, regardless of the movement direction. (A2) Correlation coefficient (R values) for Agonist (Ago) and Displ or Ago and Vel for all of the control subjects. For the directions with two agonists, we calculated the mean R for the two muscles. The data from 10 control subjects were averaged. For the abbreviations of direction and muscle name, see Figs 1 and 2, respectively. (B1) The same convention as in (A1) for the data from the patient shown in Fig 5A. (B2) The same convention as in (A2) for the data from the 19 patients with cerebellar ataxia.