Z-transformed synergy indices, ΔV, computed with respect to FTOT (ΔVF), MTOT (ΔVM), and {FTOT, MTOT} stabilization (ΔVFM) for the PD (gray bars) and CS (white bars) groups. Average values across subjects are presented with standard error bars. PR and SU stand for pronation and supination, respectively. The asterisks show statistically significant differences between the PD and CS groups at p < 0.05.