Israël I, Siegler I, Rivaud-Péchoux S, Gaymard B, Leboucher P, Ehrette M, Berthoz A, Pierrot-Deseilligny C, Flash T
LPPA, CNRS-Collège de France, Paris, France.
Neurosci Lett. 2006 Jul 24;402(3):244-8. doi: 10.1016/j.neulet.2006.04.005. Epub 2006 May 15.
The vestibular system detects the velocity of the head even in complete darkness, and thus contributes to spatial orientation. However, during vestibular estimation of linear passive self-motion distance in darkness, healthy human subjects mainly rely on time, and they replicate also stimulus duration when required to reproduce previous self-rotation. We then made the hypothesis that the perception of vestibular-sensed motion duration is embedded within encoding of motion kinetics. The ability to estimate time during passive self-motion in darkness was examined with a self-rotation reproduction paradigm. Subjects were required to replicate through self-driven transport the plateau velocity (30, 60 and 90 degrees /s) and duration (2, 3 and 4s) of the previously imposed whole-body rotation (trapezoid velocity profile) in complete darkness; the rotating chair position was recorded (500 Hz) during the whole trials. The results showed that the peak velocity, but not duration, of the plateau phase of the imposed rotation was accurately reproduced. Suspecting that the velocity instruction had impaired the duration reproduction, we added a control experiment requiring subjects to reproduce two successive identical rotations separated by a momentary motion interruption (MMI). The MMI was of identical duration to the previous plateau phase. MMI duration was fidelitously reproduced whereas that of the plateau phase was hypometric (i.e. lesser reproduced duration than plateau) suggesting that subjective time is shorter during vestibular stimulation. Furthermore, the accurate reproduction of the whole motion duration, that was not required, indicates an automatic process and confirms that vestibular duration perception is embedded within motion kinetics.
前庭系统即使在完全黑暗的环境中也能检测到头部的速度，从而有助于空间定向。然而，在黑暗中通过前庭估计线性被动自我运动距离时，健康的人类受试者主要依赖时间，并且在需要重现先前的自我旋转时，他们也会复制刺激持续时间。于是我们提出一个假设，即前庭感知运动持续时间的感知嵌入在运动动力学编码中。我们使用自我旋转再现范式研究了在黑暗中被动自我运动期间估计时间的能力。要求受试者在完全黑暗的环境中通过自主驱动的运输方式重现先前施加的全身旋转（梯形速度曲线）的平台速度（30、60和90度/秒）和持续时间（2、3和4秒）；在整个试验过程中记录旋转椅的位置（500赫兹）。结果表明，施加旋转的平台期的峰值速度能够被准确重现，但持续时间不能。由于怀疑速度指令会干扰持续时间的再现能力，我们增加了一个对照实验，要求受试者重现两个连续的相同旋转，中间有一个短暂运动中断（MMI）。MMI的持续时间与先前平台期的持续时间相同。MMI的持续时间能够被准确重现，而平台期的持续时间则被低估（即再现的持续时间比平台期短），这表明在前庭刺激期间主观时间更短。此外，对不需要准确重现的整个运动持续时间的准确再现表明这是一个自动过程，并证实前庭持续时间感知嵌入在运动动力学中。
