1From typing on a keyboard to playing the piano, many everyday skills require the ability 2 to quickly and accurately perform sequential movements. It is well-known that the 3 availability of rewards lead to increases in motivational vigor whereby people enhance 4 both the speed and force of their movements. However, in the context of motor skills, it 5 is unclear whether rewards also lead to more effective motor planning and action 6 selection. Here, we trained human participants to perform four separate sequences in a 7 skilled motor sequencing task. Two of these sequences were trained explicitly and 8 performed with pre-cues that allow for the preplanning of movements, while the other 9 two were trained implicitly. Immediately following the introduction of performance-10 contingent monetary incentives, participants improved their performance on all 11 sequences consistent with enhancements in motivational vigor. However, there was a 12 much larger performance boost for explicitly trained sequences. Furthermore, only on 13 explicit sequences was the size of this incentive-based enhancement correlated with the 14 amount of skill knowledge gained. We replicated these results in a second, pre-15 registered experiment with an independent sample. We conclude from these 16 experiments that rewards enhance both the pre-planning of movements as well as 17 motivational vigor. 18 19 20 21
Keywords 22Reward, sequence learning, motor learning, implicit, explicit, motor skills 23 24