Figure 9
From: Control of thumb force using surface functional electrical stimulation and muscle load sharing
Stationary errors in 2D force control. Box plots of stationary errors in 2D force control trials. 0.5 N and 1.0 N targets are shown separately for feedforward control only and the combination feedforward and feedback control and for healthy subjects and stroke subjects. Numbers above the individual box plots indicate the total number of evaluated targets in that group, which was influenced by the workspace area of the individual subjects. Significant differences between groups were calculated by the non-parametric Mann-Whitney U test and indicated by asterisks.