Dynamics of Spatial Distortions Reveal Multiple Time Scales of Motion Adaptation
Dynamics of Spatial Distortions Reveal Multiple Time Scales of Motion Adaptation
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DOI：
10.1152/jn.00548.2009
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发表时间：
2009-12-01
影响因子：
2.5
通讯作者：
McGraw, Paul V.
中科院分区：
文献类型：
--
作者：
Roach, Neil W.;McGraw, Paul V.
罗奇 NW，麦格劳 PV。空间扭曲的动力学揭示了运动适应的多个时间尺度。 J Neurophysiol 102: 3619-3626, 2009。首次发表于 2009 年 10 月 7 日； doi：10.1152/jn.00548.2009。长时间暴露在一致的视觉运动中会显着改变随后观看物体的感知方向和速度。这些知觉后遗症为研究运动适应机制和推断潜在神经群体的特性提供了宝贵的工具。对运动后遗症的时间过程的行为研究通常揭示了跨越数秒的逐渐适应过程。相比之下，神经生理学研究已经记录了在相似或更快（即亚秒）时间尺度上运行的多种运动适应效应。在这里，我们通过测量运动刺激扭曲短暂呈现的静态物体的感知位置的能力随时间的变化来研究运动适应。这些运动引起的空间扭曲的时间动力学揭示了具有不同属性的两种可分离的运动适应机制的运作。第一个是快速的（亚秒级），用于限制由连续运动引起的失真，但一旦运动信号消失就不足以产生后遗症。第二个在几秒钟内逐渐累积，不会调节连续运动产生的扭曲的大小，并在运动偏移后产生排斥的后遗症。这些结果为在不同时间尺度上运行的多种运动适应机制的运作提供了新的心理物理学证据。
Roach NW, McGraw PV. Dynamics of spatial distortions reveal multiple timescales of motion adaptation. J Neurophysiol 102: 3619-3626, 2009. First published October 7, 2009; doi: 10.1152/jn.00548.2009. Prolonged exposure to consistent visual motion can significantly alter the perceived direction and speed of subsequently viewed objects. These perceptual aftereffects have provided invaluable tools with which to study the mechanisms of motion adaptation and draw inferences about the properties of underlying neural populations. Behavioral studies of the time course of motion aftereffects typically reveal a gradual process of adaptation spanning a period of multiple seconds. In contrast, neurophysiological studies have documented multiple motion adaptation effects operating over similar, or substantially faster (i.e., sub-second) time scales. Here we investigated motion adaptation by measuring time-dependent changes in the ability of moving stimuli to distort the perceived position of briefly presented static objects. The temporal dynamics of these motion-induced spatial distortions reveal the operation of two dissociable mechanisms of motion adaptation with differing properties. The first is rapid (sub-second), acts to limit the distortions induced by continuing motion, but is not sufficient to produce an aftereffect once the motion signal disappears. The second gradually accumulates over a period of seconds, does not modulate the size of distortions produced by continuing motion, and produces repulsive aftereffects after motion offset. These results provide new psychophysical evidence for the operation of multiple mechanisms of motion adaptation operating over distinct time scales.