Nishida S, Johnston A
Human and Information Science Research Laboratory, NTT Communication Science Laboratories, Kanagawa, Japan.
Nature. 1999 Feb 18;397(6720):610-2. doi: 10.1038/17600.
After adaptation of the visual system to motion of a pattern in a particular direction, a static pattern appears to move in the opposite direction-the motion aftereffect (MAE). It is thought that the MAE is not accompanied by a shift in perceived spatial position of the pattern being viewed, providing psychophysical evidence for a dissociation of the neural processing of motion and position that complements anatomical and physiological evidence of functional specialization in primate and human visual cortex. However, here we measure the perceived orientation of a static windmill pattern after adaptation to rotary motion and find a gradual shift in orientation in the direction of the illusory rotation, though at a rate much lower than the apparent rotation speed. The orientation shift, which started to decline within a few seconds, could persist longer than the MAE, and disappeared when the MAE was nulled by physical motion of the windmill pattern. Our results indicate that the representation of the position of spatial pattern is dynamically updated by neurons involved in the analysis of motion.
在视觉系统适应了特定方向上图案的运动之后，一个静止的图案似乎会朝着相反的方向移动——即运动后效（MAE）。人们认为，运动后效并不伴随着所观察图案的感知空间位置的偏移，这为运动和位置的神经处理分离提供了心理物理学证据，补充了灵长类动物和人类视觉皮层功能特化的解剖学和生理学证据。然而，在这里我们测量了在适应旋转运动后一个静止风车图案的感知方向，发现方向朝着虚幻旋转的方向逐渐偏移，尽管其速率远低于表观旋转速度。方向偏移在几秒钟内开始下降，可能比运动后效持续更长时间，并且当风车图案的物理运动消除运动后效时，方向偏移就会消失。我们的结果表明，参与运动分析的神经元会动态更新空间图案位置的表征。
