Fig. 6.

Group mean (standard error) measures of foot placement and postural sway temporal persistence during visually perturbed walking compared to normal, unperturbed walking for our primary conditions. Horizontal black lines represent DFA scaling exponents corresponding to uncorrelated white noise (i.e., α = 0.5), and gray region represents those corresponding to temporal anti-persistence (i.e., α < 0.5). Single asterisks (*) indicate significant difference between normal and visually perturbed walking and double asterisks (**) indicate significantly different from uncorrelated white noise (p<0.05). Superscript numbers indicate significant differences between visual perturbations (p<0.05).