Average pattern of compensation of each group to the skewed lateral shift probability distribution for A) separate bins of trials and B) averaged across the last 400 trials.

<p>In <b>A)</b>, all experimental trials are represented in the line graph (bins 1–50), where each point represents the average of 10 trials. The circles at bin 0 represent the average of trials 1–3 and are displayed to show the similarity between groups immediately after perturbation onset. In both <b>A)</b> and <b>B)</b>, the upper dashed line represents the optimal compensation (location to aim the hand) that maximizes the probability of hitting the target , based on the movement variability of the Reinforcement group. The lower dashed line represents the optimal compensation (location to aim the hand) that minimizes squared error . These findings suggest that the sensorimotor system heavily weights error feedback over reinforcement feedback when both forms of feedback are available. Error bars represent ±1 standard error of the mean. * p < 0.05.