Recent work in highly trained monkeys suggests that decision-making and motor control are linked processes whose regulation by urgency allows reward rate optimization. However, such urgency-based mechanism might be species-specific and/or a consequence of practice. Here I show that the unified regulation hypothesis exists in naïve human subjects. Seventeen volunteers performed a reach decision task in which blocks of trials encouraged either risky or conservative choices. Participants performed at least two sessions in which they were indirectly motivated to maximize their reward rate. Results show that subjects' accuracy criterion decreased over time within each trial, and that decisions were earlier and less accurate in fast than slow blocks, with a larger difference in session #2 compared to session #1. A simple model in which sensory information is combined with a growing urgency signal captured these effects. Crucially, arm and eye movement vigor systematically increased as decision duration increased within blocks and the block-dependent decision policy strongly predicted the kinematics of reaching movements. These results suggest a practice-independent mechanistic link for establishing the unified control of human decision timing and action vigor in order to optimize the rate of reward.

中文翻译：

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决策的紧迫性激发了人类的运动。

最近在训练有素的猴子中进行的工作表明，决策和运动控制是相互联系的过程，通过紧急情况进行调节可以优化奖励率。但是，这种基于紧急度的机制可能是特定于物种的和/或实践的结果。在这里，我证明了统一的调节假设存在于纯真的人类受试者中。17名志愿者执行了一项可达性决策任务，其中的每组试验都鼓励冒险或保守的选择。参与者至少进行了两次会议，间接地激励他们最大化他们的奖励率。结果表明，受试者的准确性标准在每次试验中随时间降低，并且决策较慢块更快且准确性较慢，与会话1相比，会话2的差异更大。一个简单的模型，其中感官信息与不断增加的紧急信号相结合，捕获了这些影响。至关重要的是，随着块内决策持续时间的增加，手臂和眼睛的运动活力会系统地增强，并且依赖块的决策策略强烈预测了达到运动的运动学。这些结果暗示了一种与实践无关的机制链接，用于建立对人类决策时机和动作活力的统一控制，从而优化奖励率。