Experiment 1 mean initial movement vector across participants per trial.

(a) Dot colour for trial t represents the level of sensory uncertainty applied at midpoint on the previous trial t − 1. Performance during the washout phase is shown by purple x’s. The inset bar graph shows the mean difference between the last 10 trials of adaptation and the first 10 trials of washout plotted separately for each uncertainty level. Error bars are 95% confidence intervals. (b) Dot colour for trial t represents the error at reach midpoint on the same trial. (c) Dot colour for trial t represents the error at the reach endpoint on the previous trial t − 1.