Gaze and the Control of Foot Placement When Walking in Natural Terrain.
Gaze and the Control of Foot Placement When Walking in Natural Terrain.
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DOI：
10.1016/j.cub.2018.03.008
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发表时间：
2018-04-23
期刊：
影响因子：
--
通讯作者：
Hayhoe MM
中科院分区：
文献类型：
--
作者：
Matthis JS;Yates JL;Hayhoe MM
人类在自然环境中的运动需要两足步态周期的生物力学和眼睛运动之间的精确协调，这些运动收集了指导脚部放置所需的信息。然而，关于视觉系统和运动系统如何协同工作来支持在世界各地的运动，人们知之甚少。我们开发了一种系统，可以同时记录在不同室外地形上移动时的凝视和全身运动学。我们发现，步行者不仅根据穿越不同复杂性路径所需的特定信息调整他们的凝视行为，而且他们这样做的同时，他们在所有地形上保持一个恒定的时间前瞻窗口。这一策略允许步行者使用凝视来定制他们能量最佳的首选步态周期，以适应即将到来的路径，以便在高效移动的驱动力和将双脚放置在稳定位置之间取得平衡。眼球运动和运动以一种反映能量成本、环境不确定性和运动任务的瞬时信息需求的整合的方式紧密联系在一起。因此，凝视和步态之间的关系揭示了在面对自然界不同的需求时，支持成功表现的感觉-运动决策的结构。Matthis et al.记录受试者在真实世界运动过程中的凝视和全身运动学。步行者根据每一种地形的需求显示出不同的凝视策略。然而，步行者也在所有的地形上采用了恒定的前瞻时间。步行者调整凝视行为，以在所有地形上维持一致的运动策略。
Human locomotion through natural environments requires precise coordination between the biomechanics of the bipedal gait cycle and the eye movements that gather the information needed to guide foot placement. However, little is known about how the visual and locomotor systems work together to support movement through the world. We developed a system to simultaneously record gaze and full-body kinematics during locomotion over different outdoor terrains. We found that not only do walkers tune their gaze behavior to the specific information needed to traverse paths of varying complexity but that they do so while maintaining a constant temporal look-ahead window across all terrains. This strategy allows walkers to use gaze to tailor their energetically optimal preferred gait cycle to the upcoming path in order to balance between the drive to move efficiently and the need to place the feet in stable locations. Eye movements and locomotion are intimately linked in a way that reflects the integration of energetic costs, environmental uncertainty, and momentary informational demands of the locomotor task. Thus, the relationship between gaze and gait reveals the structure of the sensorimotor decisions that support successful performance in the face of the varying demands of the natural world. Matthis et al. recorded subjects’ gaze and full-body kinematics during real-world locomotion. Walkers show distinct gaze strategies appropriate for the demands of each terrain. Nevertheless, walkers also adopted a constant look-ahead time across all terrains. Walkers tune gaze behavior to sustain consistent locomotor strategy in all terrains.
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发表时间：
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期刊：
Cortex; a journal devoted to the study of the nervous system and behavior
影响因子：
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发表时间：
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期刊：
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影响因子：
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影响因子：
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