Figure 2. Task performance improved in the point-to-point and tracking tasks.

(A) Performance in the point-to-point task, as quantified by initial reach direction error, is plotted as heat maps for the rotation group (top) and mirror-reversal groups (bottom). Each column shows the distribution of initial reach direction errors, pooled across all participants, over a horizontal bin of 15 trials. The intensity of color represents the number of trials in each 10° vertical bin where the maximum possible value of each bin is 150 (15 trials for 10 participants for each group). (B) Example tracking trajectories from a representative participant in each group. Target trajectories are shown in black while cursor trajectories are shown in brown. Each trajectory displays approximately 5 s of movement. (C) Performance in the tracking task as quantified by average mean-squared positional error between the cursor and target during each 40 s trial. Individual participants are shown in thin lines and group mean is shown in thick lines.

Figure 2—video 1. Video of tracking behavior at different time points during learning.

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