Fig. 2From: Disentangling stability and flexibility degrees in Parkinson’s disease using a computational postural control modelGroup mean Power Spectral Density (PSD) diagrams. PSD diagrams for COP displacement (left) and COP velocity (right) for PD patients before (PD-Pre) and after (PD-Post) balance training, as well as healthy control subjects in four tasks (a to d)Back to article page