Behavioral data. A, For a representative participant, PD of the last 60 trials of the familiarization phase (Blocks 3 and 4) and the 1200 trials of the experimental phase. Trials were binned into four categories according to their PD (color bands): No_PD, Small_PD, Medium_PD, and Large_PD. B, For the same participant, hand paths for all individual trials of the experimental phase; colored stars show hand positions at movement ends. The mean hand-paths for the different categories of trials are plotted in thick lines mean hand-positions at velocity-peak and movement-end are shown by crosses and squares, respectively. The eye-fixation donut (visual feedback) is also indicated in gray. C, Box plots indicating for each categories of trials, the 25th, 50th, and 75th percentiles, as well as the extreme values of the mean PD of all trials.