Fig. 3

Graphical representation of the center-of-pressure (CoP) parameters referred to the dynamic balance assessment over the electrically-driven mobile platform. A CoP trajectory (black line) and 95^th percentile ellipse (blue line) within the 2.5-s time window from the beginning of the perturbation. B CoP-related parameters referred to the anterior–posterior CoP trajectory (black line) following the electrically-driven mobile platform displacement (red line). The gray dotted line marks the perturbation point (PP); the green dotted line represents the mean value of the anterior–posterior CoP trajectory before the perturbation occurs