Figure 3. Motor Task Accuracy.

A) Across the entire experiment, increasing incentives increased accuracy up to a point ($10 trials) beyond which accuracy began to suffer. B) Participants had significantly increased accuracy on $10 trials relative to both $5 and $40 trials during the first half of the experiment, but there were no significant differences in accuracy for the different levels of incentive during the second half of the experiment. See also Supplementary Table 1.