Fig. 4

MCS–ESB representation. Graphs a-d: Bidimensional representation of motion performance according to the parameters MCS (x-axis) and ESB (y-Axis). Each row represents elbow flexion and steering motions, respectively. In the first column, healthy young and elder values are shown. In the second column, patient data are represented in different colors depending on the SIAS level. Graphs e-f: Intra-day variability of both parameters was measured from the standard deviation of the metrics obtained within single daily sessions. Values are represented for each group of subjects to show the average variability of MCS and ESB computed on consecutive trials. Values enclosed by red dotted circles on graph d represent examples of two patients whose motor impairment are classified at the same SIAS level even though their neurological origins are quite different