Task goals shape the relationship between decision and movement speed
(2024) Journal of Neurophysiology — Vol. 132, n° 6, p. 1837-1856 (2024)
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- The speed at which we move is linked to the speed at which we decide to make these 31 movements. Yet, the principles guiding such relationship remain unclear: while some 32 studies point towards a shared invigoration process boosting decision and movement 33 speed jointly, others rather indicate a tradeoff between both levels of control, with 34 slower movements accompanying faster decisions. Here, we aimed (1) at further 35 investigating the existence of a shared invigoration process linking decision and 36 movement and (2) at testing the hypothesis that such a link is masked when 37 detrimental to the reward rate. To this aim, we tested 62 subjects who performed the 38 tokens task in two experiments (separate sessions): Experiment 1 evaluated how 39 changing decision speed affects movement speed while Experiment 2 assessed how 40 changing movement speed affects decision speed. In the latter experiment, subjects 41 were either encouraged to favor decision speed (fast decision group) or decision 42 accuracy (slow decision group). Various mixed model analyses revealed a 43 coregulation of decision (urgency) and movement speed in Experiment 1 and in the 44 fast decision group of Experiment 2, but not in the slow decision group despite the fact 45 that these same subjects displayed a coregulation effect in Experiment 1. Altogether, 46 our findings support the idea that coregulation occurs as a default mode but that this 47 form of control is diminished or supplanted by a tradeoff relationship, contingent on 48 reward rate maximization. Drawing from these behavioral observations, we propose 49 that multiple processes contribute to shaping the speed of decisions and movements.
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Fievez, F., Cos, I., Carsten, T., Derosiere, G., Zenon, A., & Duque, J. (2024). Task goals shape the relationship between decision and movement speed. Journal of Neurophysiology, 132(6), 1837-1856. https://doi.org/10.1152/jn.00126.2024 (Original work published 2024)