Pailhous J, Ferrandez A M, Flückiger M, Baumberger B
Université Aix-Marseille II, C.N.R.S. URA1166, IBHOP, Marseille, France.
Behav Brain Res. 1990 May 28;38(3):275-81. doi: 10.1016/0166-4328(90)90181-d.
Visual whole-field motion is known to trigger motor responses which minimize retinal slip (VOR, OKN and control of balance). In locomotion, however, the retinal slip is utilized to control the velocity and direction of displacement. The present experiment was aimed at determining how the velocity of optical flow affects the regulation of locomotion. Unintentional modulations in velocity, stride length and cadence were analyzed using a task in which artificial optical flow gave the subjects the impression they were walking at a different speed than they actually were. Slight but systematic modifications in locomotion were observed: experimental variation of the optical flow resulted in a decrease in stride length. None of the subjects were aware of this decrease, despite the fact that their muscular and articular afferences provided them with supraliminal information. Although visual flow velocity is usually a direct consequence of walking velocity, experimental modifications of visual flow were found here to cause unintentional modulations in locomotor parameters (stride length and cadence) more than in their product (velocity).
已知视觉全场运动可触发运动反应，从而将视网膜图像滑动降至最低（前庭眼反射、视动眼震和平衡控制）。然而，在移动过程中，视网膜图像滑动被用于控制位移的速度和方向。本实验旨在确定光流速度如何影响移动的调节。通过一项任务分析了速度、步长和步频的无意调制，在该任务中，人工光流让受试者产生他们正以与实际不同的速度行走的错觉。观察到移动中有轻微但系统的变化：光流的实验变化导致步长减小。尽管他们的肌肉和关节传入神经为他们提供了阈上信息，但没有一个受试者意识到这种减小。虽然视觉流速度通常是行走速度的直接结果，但在此发现视觉流的实验性改变对运动参数（步长和步频）的无意调制比对其乘积（速度）的调制更多。
