Fig 2. Temporal-spatial means and variability values during unperturbed and perturbed walking.

Walking conditions are labeled as NOP–no perturbation, COG–cognitive perturbation, PLAT–physical perturbation, and VIS–visual perturbation. Group means and standard deviations are depicted for each measure, condition, and session. Significant differences (p < 0.05) between the unperturbed and each perturbed walking condition during the same session are labelled with an *. Significant differences between sessions for each measure of the same condition are highlighted with a dotted box containing calculated p values.