RT Journal Article
SR Electronic
T1 Reward-based invigoration of sequential reaching
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2020.06.15.152876
DO 10.1101/2020.06.15.152876
A1 Sebastian Sporn
A1 Xiuli Chen
A1 Joseph M Galea
YR 2020
UL http://biorxiv.org/content/early/2020/06/16/2020.06.15.152876.abstract
AB Seeking reward is a powerful tool for shaping human behaviour. While it has been demonstrated that reward invigorates performance of simple movements, its effect on more complex sequential actions is less clear. In addition, it is unknown why reward-based improvements for discrete actions are transient, i.e. performance gains are lost once reward is removed, but appear long lasting for sequential actions. We show across three experiments that reward invigorates sequential reaching performance. Driven by a reward-based increase in speed, movements also exhibited greater coarticulation, smoothness and a closer alignment to a minimum jerk trajectory. Critically, these performance gains were maintained across multiple days even after the removal of reward. We propose that coarticulation, the blending together of sub-movements into a single continuous action, provides a mechanism by which reward can invigorate sequential performance whilst also increasing efficiency. This change in efficiency appears essential for the retention of reward-based improvements in motor behaviour.Competing Interest StatementThe authors have declared no competing interest.