Fig. 3

Pearson correlation coefficient between clinical scales (FM-UE, CAHAI, BI) and \(J(\sigma )\) (Eq. 4) obtained for the lateral (left/right) direction of the paretic hand trajectory at different values of \(\sigma\) for the ‘Spheroids’ dataset (Table 1). The high-frequency peak is at about \(\sigma =0.01\) s for all three scales. The low-frequency peak is at \(\sigma =8.8\) s for FM-UE, \(\sigma =5.9\) s for CAHAI, and \(\sigma =17\) s for BI