Figure 4.

Time course of experiment 2

(A) The experiment was divided into baseline, exposure, and washout phases. Participants encountered random disturbances with low and high levels of variability in the exposure phase. The order of the low and high variability conditions was counterbalanced across participants. Gray vertical lines denote step-torque perturbation trials (mechanical probes) that were used to probe the feedback gains on randomly selected trials throughout the experiment. Participants also performed unperturbed trials (navy blue vertical lines).

(B) Time course of representative trials. The random disturbances were sampled every 25 ms from distributions with low (μ = 0, σ = 1 Nm) and high variability (μ = 0, σ = 2 Nm).

(C) Distributions of random disturbances encountered by an exemplar participant across trials during the exposure phase.