Figure 2

Comparison of step length asymmetry (SLA) during adapt 1 and adapt 2 (i.e. savings) among the Small (red and black traces) (a), Medium (pink and purple traces) (b), and Large (cyan and blue) (c) perturbation groups in Experiment 1. Mean curves across participants within each group ± SE are shown. The curves are truncated in length to match the participant that took the fewest strides during each condition. Data points immediately following the adapt 1 and adapt 2 curves show the SLA during the plateau (mean ± SE of the last 30 strides) for each group. (d) Bar graphs are shown indicating the SLA during initial (mean of the first 5 strides), early change (mean of strides 6–30), late change (mean of strides 30–200), and plateau of adapt 1 and adapt 2 for each group (mean ± SE). **Indicates a significant group*learning bout interaction effect for that epoch (P < 0.05). Lines indicate significant differences between adapt 1 and adapt 2 found with LSD posthoc tests (P < 0.05). The statistical analyses are described in Methods.