The perceptual control of goal-directed locomotion: a common control architecture for interception and navigation?
The perceptual control of goal-directed locomotion: a common control architecture for interception and navigation?
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DOI：
10.1007/s00221-004-1880-7
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发表时间：
2004-09-01
影响因子：
2
通讯作者：
Bootsma, RJ
中科院分区：
文献类型：
--
作者：
Chardenon, A;Montagne, G;Bootsma, RJ
在移动时拦截移动物体是一项非常复杂且要求很高的能力。尽管确定了几个信息候选者，但感知变量在这些技能背后的控制过程中的作用仍然是一个悬而未决的问题。在这项研究中，我们使用虚拟现实装置来研究移动球的运动拦截。受试者必须沿着直线路径行走，并且可以在必要时自由改变前进速度，以便用头部拦截沿着直线路径移动的球，使其穿过代理的位移轴。在一系列实验中，我们操纵了视觉流的局部（球大小）和全局（扩展焦点）组件，以及球的自我中心方向。动态模型很好地捕捉了实验观察结果，该模型将运动加速度与全局流和自我中心方向的属性联系起来。更准确地说，运动速度的变化取决于方位角变化和自我中心方向变化的线性组合，从而允许在各种情况下出现适应性行为。我们的结论是，控制不同目标导向的运动任务（即转向和拦截任务）的机制可以共享一个通用的架构。
Intercepting a moving object while locomoting is a highly complex and demanding ability. Notwithstanding the identification of several informational candidates, the role of perceptual variables in the control process underlying such skills remains an open question. In this study we used a virtual reality set-up for studying locomotor interception of a moving ball. The subject had to walk along a straight path and could freely modify forward velocity, if necessary, in order to intercept-with the head-a ball moving along a straight path that led it to cross the agent's displacement axis. In a series of experiments we manipulated a local (ball size) and a global (focus of expansion) component of the visual flow but also the egocentric orientation of the ball. The experimental observations are well captured by a dynamic model linking the locomotor acceleration to properties of both global flow and egocentric direction. More precisely the changes in locomotor velocity depend on a linear combination of the change in bearing angle and the change in egocentric orientation, allowing the emergence of adaptive behavior under a variety of circumstances. We conclude that the mechanisms underlying the control of different goal-directed locomotion tasks (i.e. steering and interceptive tasks) could share a common architecture.