FREQUENCY-DEPENDENCE OF THE ACTION-PERCEPTION CYCLE FOR POSTURAL CONTROL IN A MOVING VISUAL ENVIRONMENT - RELATIVE PHASE DYNAMICS
FREQUENCY-DEPENDENCE OF THE ACTION-PERCEPTION CYCLE FOR POSTURAL CONTROL IN A MOVING VISUAL ENVIRONMENT - RELATIVE PHASE DYNAMICS
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DOI：
10.1007/bf00198467
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发表时间：
1994-10-01
影响因子：
1.9
通讯作者：
GIELEN, CCAM
中科院分区：
文献类型：
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作者：
DIJKSTRA, TMH;SCHONER, G;GIELEN, CCAM
当站立的人暴露在运动的视觉环境中时，诱发的姿势摆动与视觉信息表现出不同程度的一致性。在我们的实验中，我们改变了振荡视觉显示的频率，并分析了视觉运动和摆动之间的时间关系。我们发现，即使失去了与显示器的时间一致性，受试者仍保持着相当大的摇摆幅度。姿势摆动倾向于相位超前(频率低于0.2赫兹)或相位滞后(频率大于0.3赫兹)。然而，我们也在固定频率下观察到高度可变的相位关系，其中普遍存在一个优选的相位滞后范围，但是在相位开始漂移出优选的制度之后，会发生相位跳跃，使系统返回到优选的范围。通过与动力学模型(正弦-圆图)的定量比较，我们表明这种效应可以理解为一种相对协调的形式，并通过动作-知觉循环动力学的不稳定而产生。因为这种不稳定性在被动驱动的系统中不会出现，我们得出结论，在这种情况下，姿势摆动是作为动态耦合到视觉运动的有节奏的运动而主动产生的。
When standing human subjects are exposed to a moving visual environment, the induced postural sway displays varying degrees of coherence with the visual information. In our experiment we varied the frequency of an oscillatory visual display and analysed the temporal relationship between visual motion and sway. We found that subjects maintain sizeable sway amplitudes even as temporal coherence with the display is lost. Postural sway tended to phase lead (for frequencies below 0.2 Hz) or phase lag (above 0.3 Hz). However, we also observed at a fixed frequency, highly variable phase relationships in which a preferred range of phase lags is prevalent, but phase jumps occur that return the system into the preferred range after phase has begun drifting out of the preferred regime. By comparing the results quantitatively with a dynamical model (the sine-circle map), we show that this effect can be understood as a form of relative coordination and arises through an instability of the dynamics of the action-perception cycle. Because such instabilities cannot arise in passively driven systems, we conclude that postural sway in this situation is actively generated as rhythmic movement which is coupled dynamically to the visual motion.