Lateral visual occlusion does not change walking trajectories.
Lateral visual occlusion does not change walking trajectories.
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DOI：
10.1167/18.9.11
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发表时间：
2018-09-04
影响因子：
1.8
通讯作者：
Rushton SK
中科院分区：
文献类型：
--
作者：
Dunn MJ;Rushton SK
行走困难通常是在脑损伤导致一侧意识丧失后出现的。偏侧意识丧失是否对行走有直接的因果影响尚不清楚。一篇关于视觉引导行走的文献综述提出了几个原因，为什么视觉意识的侧向丧失可能会导致行走困难。在这里，我们分离并检查了侧视丧失对真实和虚拟环境中行走行为的影响。健康的年轻参与者走到放置在真实房间、虚拟走廊或虚拟地平面上的目标。在地平面条件下，场景要么是空的，要么包含三个障碍物。通过使用眼罩（实验1）和虚拟现实系统（实验2），我们通过遮挡一只眼睛（实验1和2）或移除一个相对于头部或躯干的半视野（实验2）来降低一侧的视力。在任何遮挡条件下或任何环境下，视野限制都不会导致行走路径的显著偏差。研究结果进一步揭示了指导人类行走的视觉信息，并表明偏侧视力丧失本身并不是行走困难的主要原因。
Difficulties with walking are often reported following brain damage that causes a lateralized loss of awareness on one side. Whether lateralized loss of awareness has a direct causal impact on walking is unknown. A review of the literature on visually guided walking suggests several reasons why a lateralized loss of visual awareness might be expected to lead to difficulties walking. Here, we isolated and examined the effect of lateralized vision loss on walking behavior in real and virtual environments. Healthy young participants walked to a target placed within a real room, in a virtual corridor, or on a virtual ground plane. In the ground-plane condition, the scene either was empty or contained three obstacles. We reduced vision on one side by occluding one eye (Experiment 1 and 2) or removing one hemifield, defined relative to either the head or trunk (Experiment 2), through use of eye patching (Experiment 1) and a virtual-reality system (Experiment 2). Visual-field restrictions did not induce significant deviations in walking paths in any of the occlusion conditions or any of the environments. The results provide further insight into the visual information that guides walking in humans, and suggest that lateralized vision loss on its own is not the primary cause of walking difficulties.
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