在曲线运动轨迹中解脱决策不确定性和电机噪声
William G Chapman1,2, Casimir J H Ludwig3,4,5
1University of Bristol, School of Psychological Science & Jean Golding Institute, Bristol, UK.
Journal of vision
|November 13, 2025
概括
在达到运动时的决策不确定性可能被夸大. 大多数到达轨迹都受到自然电机噪声的影响,而不是决策过程,特别是当适当考虑运动变化时.
科学领域:
- 认知神经科学 认知神经科学
- 发动机控制器的控制器
- 人类运动科学科学 人类运动科学
背景情况:
- 运动轨迹往往在决策过程中曲线向非选择的选项.
- 这种曲率通常与竞争目标相互作用有关,模型假设手的位置反映了决策状态.
- 然而,发动机噪音也会导致轨道曲率,独立于决策.
研究的目的:
- 解开决策不确定性和电机噪声的贡献,以达到轨迹曲率.
- 评估现有模型是否充分考虑了自然移动的变化.
- 为了确定决策不确定性的真正影响到到达的行动.
主要方法:
- 参与者在两个块中的一个上执行了触摸到抓取的动作,操纵了亮度差异以改变决策不确定性.
- 记录了基线到达单个目标,以建模因电机噪声而导致的曲率变化.
- 统计模型在选择条件下将基线变化与曲率分布进行了比较.
主要成果:
- 一个混合模型,结合基线电机噪声和选择组件,最好解释曲率分布.
- 选择组件的影响很小,这表明大多数影响不受决策不确定性的影响.
- 观察到的射程轨迹在很大程度上与发动机噪声的自然变化相兼容.
结论:
- 决策不确定性在触及轨迹曲率中的作用可能被高估了.
- 考虑电机噪声和其他与决策无关的变化对于准确的解释至关重要.
- 未来的研究应该在从运动轨迹推断决策过程时仔细控制基线运动变化.
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