Lorenceau J, Shiffrar M
Laboratoire de Psychologie Expérimentale, Université René Descartes, CNRS, Paris, France.
Vision Res. 1992 Feb;32(2):263-73. doi: 10.1016/0042-6989(92)90137-8.
Individual motion measurements are inherently ambiguous since the component of motion parallel to a homogeneous translating edge cannot be measured. Numerous models have proposed that the visual system solves this ambiguity through the integration of motion measurements across disparate contours. To examine this proposal, subjects observed a translating diamond through four stationary apertures. Since the diamond's motion could not be determined from any single contour, motion integration across contours was required to determine the diamond's direction of motion. We demonstrate that observers have difficulty accurately integrating motion information across space. Performance improved when the diamond stimulus was presented at 7 degrees eccentricity, through jagged apertures, or at low contrast. Taken together, these results imply that integration across space is more likely when the motion of contour terminators is less salient or reliable.
由于与均匀平移边缘平行的运动分量无法测量，个体运动测量本质上是模糊的。许多模型提出，视觉系统通过整合不同轮廓上的运动测量来解决这种模糊性。为了检验这一观点，受试者通过四个固定孔径观察一个平移的菱形。由于无法从任何单个轮廓确定菱形的运动，因此需要跨轮廓进行运动整合来确定菱形的运动方向。我们证明，观察者在跨空间准确整合运动信息方面存在困难。当菱形刺激在7度偏心率、通过锯齿状孔径或低对比度下呈现时，表现有所改善。综合来看，这些结果表明，当轮廓终止点的运动不太显著或可靠时，跨空间整合更有可能发生。
