Lyu Wanyi, Parmar Harry, Reppert Thomas R, Schall Jeffrey D
Department of Biology, York University, Toronto, ON M3J1P3 Canada.
Centre for Vision Research, York University, Toronto ON M3J1P3 Canada.
bioRxiv. 2025 Aug 28:2025.08.25.671783. doi: 10.1101/2025.08.25.671783.
Canonical stochastic models of decision-making treats decision and action as independent and sequential processes. However, studies involving limb movements consistently show that movement duration and kinematics are influenced by the quality of evidence. We tested whether saccade velocity varies with the quality of evidence in monkeys performing a visual search GO/NOGO task in which singleton elongation cued the GO/NOGO stimulus-response rule and the location of a color singleton specified saccade endpoint. We factorially manipulated the efficiency of stimulus-response cue discrimination by varying the elongation of the singleton and the efficiency of singleton localization by varying the color similarity between the singleton and distractors. The effectiveness of the manipulations was revealed by the response times on correct trials that were separately modified by the singleton localizability and stimulus-response cue discriminability, by the incidence of localization and response selection errors with separately modified error response times. Saccade velocity was higher on correct relative to error trials and was inversely proportional to response time. Saccade velocity was separately modified by singleton localizability and stimulus-response cue discriminability. Distinct patterns of error rates and saccade velocity across monkeys indicated individual differences in decision-making strategies. These findings demonstrate that the process selecting endpoints can influence both the timing and dynamics of saccadic eye movements. Incorporating saccade vigor can provide valuable constraints on biologically plausible decision models and help address the persistent challenge of model mimicry.
决策的经典随机模型将决策和行动视为独立且相继的过程。然而，涉及肢体运动的研究一致表明，运动持续时间和运动学受证据质量的影响。我们测试了在执行视觉搜索“执行/不执行”任务的猴子中，扫视速度是否随证据质量而变化，在该任务中，单独元素的伸长提示“执行/不执行”刺激-反应规则，而颜色单独元素的位置指定扫视终点。我们通过改变单独元素的伸长来析因操纵刺激-反应线索辨别效率，并通过改变单独元素与干扰项之间的颜色相似度来操纵单独元素定位效率。通过分别由单独元素可定位性和刺激-反应线索可辨别性修改的正确试验的反应时间，以及通过分别修改错误反应时间的定位和反应选择错误发生率，揭示了操纵的有效性。相对于错误试验，正确试验中的扫视速度更高，且与反应时间成反比。扫视速度分别由单独元素可定位性和刺激-反应线索可辨别性修改。不同猴子之间错误率和扫视速度的不同模式表明了决策策略的个体差异。这些发现表明，选择终点的过程可以影响扫视眼动的时间和动态。纳入扫视活力可以为生物学上合理的决策模型提供有价值的约束，并有助于应对模型模拟的持续挑战。
