Rotating dotted ellipses: Motion perception driven by grouped figural rather than local dot motion signals
Rotating dotted ellipses: Motion perception driven by grouped figural rather than local dot motion signals
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DOI：
10.1016/j.visres.2006.12.022
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发表时间：
2007-07-01
期刊：
影响因子：
1.8
通讯作者：
Tse, P. U.
中科院分区：
文献类型：
--
作者：
Caplovitz, G. P.;Tse, P. U.
与连续轮廓的运动不同，单个点的运动是明确的，并且不受孔径问题的影响。在这里，我们利用这一事实来探索使用明确的局部运动信号来驱动对旋转椭圆的全局感知的条件。在以前的工作中，我们已经表明，一个薄的，高纵横比的椭圆将出现旋转速度比一个较低的纵横比的椭圆，即使在两个实际上以相同的角速度旋转Caplovitz，G。P.，Hsieh，P. -J.，& Tse，P. U.（2006）刚性旋转物体的感知角速度的机制。Vision Research，46（18），2877-2893]。在这项研究中，我们研究了感知速度的旋转椭圆定义的虚拟轮廓由均匀间隔的dots.Results：椭圆定义的紧密间隔的点表现出速度错觉观察连续轮廓。也就是说，当两者以相同的角速度旋转时，细虚线椭圆看起来比粗虚线椭圆旋转得更快。如果定义椭圆的点间隔太远，则观察不到这种错觉。一个控制实验排除了低空间频率的“模糊”的来源的虚幻的approp.Conclusion：即使在存在的局部运动信号，是免疫的光圈问题，全球approption的椭圆进行旋转可以驱动潜在的模糊的运动信号所产生的非本地形式的分组椭圆本身。在这里，运动感知是由紧急运动信号驱动的，例如由分组过程构建的虚拟轮廓。在图像中既不存在这些轮廓，也不存在它们出现的运动信号。(C)2007爱思唯尔有限公司保留所有权利。
Unlike the motion of a continuous contour, the motion of a single dot is unambiguous and immune to the aperture problem. Here we exploit this fact to explore the conditions under which unambiguous local motion signals are used to drive global percepts of an ellipse undergoing rotation. In previous work, we have shown that a thin, high aspect ratio ellipse will appear to rotate faster than a lower aspect ratio ellipse even when the two in fact rotate at the same angular velocity Caplovitz, G. P., Hsieh, P. -J., & Tse, P. U. (2006) Mechanisms underlying the perceived angular velocity of a rigidly rotating object. Vision Research, 46(18), 2877-2893]. In this study we examined the perceived speed of rotation of ellipses defined by a virtual contour made up of evenly spaced dots.Results: Ellipses defined by closely spaced dots exhibit the speed illusion observed with continuous contours. That is, thin dotted ellipses appear to rotate faster than fat dotted ellipses when both rotate at the same angular velocity. This illusion is not observed if the dots defining the ellipse are spaced too widely apart. A control experiment ruled out low spatial frequency "blurring" as the source of the illusory percept.Conclusion: Even in the presence of local motion signals that are immune to the aperture problem, the global percept of an ellipse undergoing rotation can be driven by potentially ambiguous motion signals arising from the non-local form of the grouped ellipse itself. Here motion perception is driven by emergent motion signals such as those of virtual contours constructed by grouping procedures. Neither these contours nor their emergent motion signals are present in the image. (C) 2007 Elsevier Ltd. All rights reserved.