Fievez Fanny, Cos Ignasi, Carsten Thomas, Derosiere Gerard, Zénon Alexandre, Duque Julie
Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium.
Facultat de Matemàtiques i Informatica, Universitat de Barcelona, Barcelona, Spain.
J Neurophysiol. 2024 Dec 1;132(6):1837-1856. doi: 10.1152/jn.00126.2024. Epub 2024 Nov 6.
The speed at which we move is linked to the speed at which we decide to make these movements. Yet the principles guiding such relationship remain unclear: whereas some studies point toward a shared invigoration process boosting decision and movement speed jointly, others rather indicate a trade-off between both levels of control, with slower movements accompanying faster decisions. Here, we aimed ) at further investigating the existence of a shared invigoration process linking decision and movement and ) at testing the hypothesis that such a link is masked when detrimental to the reward rate. To this aim, we tested 62 subjects who performed the Tokens task in two experiments (separate sessions): evaluated how changing decision speed affects movement speed, whereas assessed how changing movement speed affects decision speed. In the latter experiment, subjects were encouraged to favor either decision speed (fast decision group) or decision accuracy (slow decision group). Various mixed model analyses revealed a coregulation of decision (urgency) and movement speed in and in the fast decision group of but not in the slow decision group, despite the fact that these same subjects displayed a coregulation effect in . Altogether, our findings support the idea that coregulation occurs as a default mode but that this form of control is diminished or supplanted by a trade-off relationship, contingent on reward rate maximization. Drawing from these behavioral observations, we propose that multiple processes contribute to shaping the speed of decisions and movements. The principles guiding the relationship between decision and movement speed are still unclear. In the present behavioral study involving two experiments conducted with 62 human subjects, we report findings indicating a relationship that varies as a function of the task goals. Coregulation emerges as a default mode of control that fades when detrimental to the reward rate, possibly because of the influence of other processes that can selectively shape the speed of our decisions or movements.
我们行动的速度与我们决定做出这些行动的速度相关联。然而，指导这种关系的原则仍不明确：一些研究指出存在一个共同的激发过程，同时提高决策和行动速度；另一些研究则表明，在这两个控制层面之间存在权衡，决策速度越快，行动速度越慢。在这里，我们旨在：（1）进一步研究决策与行动之间是否存在共同的激发过程；（2）检验当这种联系对奖励率不利时会被掩盖这一假设。为此，我们在两个实验（不同场次）中对62名执行代币任务的受试者进行了测试：实验1评估改变决策速度如何影响行动速度，实验2评估改变行动速度如何影响决策速度。在后者的实验中，鼓励受试者优先考虑决策速度（快速决策组）或决策准确性（慢速决策组）。各种混合模型分析表明，在实验1和实验2的快速决策组中，决策（紧迫性）和行动速度存在共同调节，但在慢速决策组中不存在，尽管这些受试者在实验1中表现出共同调节效应。总体而言，我们的研究结果支持这样一种观点，即共同调节作为一种默认模式存在，但这种控制形式会因奖励率最大化的权衡关系而减弱或被取代。基于这些行为观察结果，我们提出多个过程共同塑造了决策和行动的速度。决策与行动速度之间关系的指导原则仍不明确。在这项涉及62名人类受试者的两个实验的行为研究中，我们报告的结果表明，这种关系会根据任务目标而变化。共同调节作为一种默认的控制模式出现，当对奖励率不利时会消失，这可能是由于其他能够选择性地塑造我们决策或行动速度的过程的影响所致。
