Main results averaged over participants.

<p><b>A)</b> Lateral pointing error in the different reward groups of the reward only condition. <b>B)</b> Lateral pointing error in the different reward groups of the reward + error condition. <b>C)</b> IMI rating for the different reward conditions (low, medium, high, random) as a function of the proportion rewarded trials with standard error of the mean. The results for the random and medium reward condition are overlapping.