Figure 5.

Scatter plot of statistical persistence and long-term local dynamic stability (LDS). Twenty subjects walked on a treadmill at slow speed (red), preferred walking speed (PWS, blue), and fast speed (green) without (circles) and with (triangles) rhythmic auditory cueing (N = 120). Detrended fluctuation analysis was used to determine the scaling exponents of the time series of stride time (α-ST, see Appendix B), which are plotted along the horizontal axis. Divergence exponents (λ_L, see Figure 4) are plotted along the vertical axis. The discontinuous line is the best linear fit (least squares method). Values are the Pearson's correlation coefficients (r).