Optic flow is used to control human walking
Optic flow is used to control human walking
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DOI：
10.1038/84054
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发表时间：
2001-02-01
影响因子：
25
通讯作者：
Sahuc, S
中科院分区：
文献类型：
--
作者：
Warren, WH;Kay, BA;Sahuc, S
人类运动是如何视觉控制的？50年前，有人提出，我们可以利用光流来引导目标，光流是眼睛的运动模式，它指定了运动的方向。然而，我们也可能只是朝着目标的方向走。这两个假设通常预测相同的行为，但我们在沉浸式虚拟环境中通过将光流从行走方向转移来测试它们，违反了光学定律。我们发现，人们走在一个孤独的目标的视觉方向，但越来越依赖于光流，因为它被添加到显示。转向目标的视觉控制律是这两个变量的线性组合，通过流量的大小加权，从而使人类在不同的环境条件下具有鲁棒的运动控制。
How is human locomotion visually controlled? Fifty years ago, it was proposed that we steer to a goal using optic flow, the pattern of motion at the eye that specifies the direction of locomotion. However, we might also simply walk in the perceived direction of a goal. These two hypotheses normally predict the same behavior, but we tested them in an immersive virtual environment by displacing the optic flow from the direction of walking, violating the laws of optics. We found that people walked in the visual direction of a lone target, but increasingly relied on optic flow as it was added to the display. The visual control law for steering toward a goal is a linear combination of these two variables weighted by the magnitude of flow, thereby allowing humans to have robust locomotor control under varying environmental conditions.