Fig. 4.

Relative cadence for each group while walking overground to the (A) subtly varying and (B) isochronous metronomes. Cadence is represented by percent of comfortable overground cadence. The control group is represented by the thin black line and square shapes for average cadence with one standard deviation from the mean represented by light blue shading. Individual data points represent cadence of each participant with PD during the time period, with the average of PwPD noted by a thicker red line. The participant who was able to detect that one metronome was varying is denoted by an open pink circle on the graphs