The many roles of vision during walking
The many roles of vision during walking
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DOI：
10.1007/s00221-010-2414-0
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发表时间：
2010-10-01
影响因子：
2
通讯作者：
Jeka, John J.
中科院分区：
文献类型：
--
作者：
Logan, David;Kiemel, Tim;Jeka, John J.
视觉可以提高站立和运动时的直立稳定性。然而，在运动过程中，视觉支持其他行为，如步态周期调节，导航和避障。在这里，我们调查的视觉的多个角色是如何反映在动态的躯干控制的神经控制问题的变化，从一个固定的移动基地的支持。受试者在站立姿势或以1 km/h和5 km/h的速度在跑步机上行走时接受低振幅或高振幅宽带视觉刺激。视觉场景运动（输入）和躯干运动学（输出）之间的频率响应函数显示，在站立姿势和行走条件下，躯干方向的增益几乎没有变化。然而，在躯干（臀部和肩膀）水平位移从姿势到运动的增益显着增加。增益的这种增加可以被解释为与视觉场景运动的增加的耦合。然而，我们认为，增加的增益反映了由于控制问题从站立到运动的变化而导致的稳定性降低。事实上，在行走过程中使用视觉保持身体直立是复杂的，因为额外的运动过程在起作用。与站立时不同，视觉在运动过程中扮演着许多角色，提供直立稳定性以及身体相对于外部环境的位置信息。
Vision can improve bipedal upright stability during standing and locomotion. However, during locomotion, vision supports additional behaviors such as gait cycle modulation, navigation, and obstacle avoidance. Here, we investigate how the multiple roles of vision are reflected in the dynamics of trunk control as the neural control problem changes from a fixed to a moving base of support. Subjects were presented with either low- or high-amplitude broadband visual stimuli during standing posture or while walking on a treadmill at 1 km/h and 5 km/h. Frequency response functions between visual scene motion (input) and trunk kinematics (output) revealed little or no change in the gain of trunk orientation in the standing posture and walking conditions. However, a dramatic increase in gain was observed in trunk (hip and shoulder) horizontal displacement from posture to locomotion. Such increases in gain may be interpreted as an increased coupling to visual scene motion. However, we believe that the increased gain reflects a decrease in stability due to a change of the control problem from standing to locomotion. Indeed, keeping the body upright with the use of vision during walking is complicated by the additional locomotor processes at work. Unlike during standing, vision plays many roles during locomotion, providing information for upright stability as well as body position relative to the external environment.