Mean subject performance in task parameters. (a) Cumulative sum distribution for mean deceleration time. Performance by control subjects shown in grey. Performance of the affected arm of subjects with stroke is shown by the leftward and rightward pointing triangles representing left-affected and right-affected subjects, respectively. Dotted line represents 95th percentile for controls. (b) Subject age versus mean endpoint error. Percentile bands of age normative model are the lines (from bottom to top) 5th, 25th, 50th, 75th, and 95th. Note the logarithmic y-axis. (c) Mean joint velocity offset during shoulder versus elbow perturbation trials. Note axes are not equally scaled. (d) Mean endpoint error versus maximum displacement. Note axes are not equally scaled and the x-axis is logarithmic. (e) Mean endpoint error versus return time. Note the logarithmic x-axis. (f) Mean deceleration time versus joint velocity offset for shoulder load trials.