Fig. S3.

(Left) Depiction of target visibility manipulations used in experiment 2C with two active targets. Horizontal bars indicate the phase of the gait cycle when the target of the corresponding color was visible. Vertical bands indicate hypothesized critical control phase for each target. (Right) Mean absolute stepping error relative to full vision control condition and 95% CI for each condition in experiment 2C. Note that results are nearly identical to those in experiment 2A with four active targets but different from those in experiment 2B with one active target (see Fig. 3). This is consistent with the two targets hypothesis, as the degree of overlap in the visibility of consecutive targets varies across conditions as it does in experiment 2A.