Bravo M J
Department of Psychology, University of Pennsylvania, Philadelphia 19104-6228, USA.
Vision Res. 1998 Mar;38(6):853-63. doi: 10.1016/s0042-6989(97)00215-0.
Observers viewed sparse random dot cinematograms in which the moving dots were confined to eight windows. The motions in seven of the windows were consistent with a global flow pattern, while the direction of motion in the eighth window deviated from this pattern. The observer's task was to determine which of the eight windows contained the inconsistent motion. The task was performed on two types of global flow patterns: spirals, which appear rigid, and deformations, which appear highly non-rigid. Although these patterns produce qualitatively different global percepts, they are exactly matched in their local velocities and velocity differences. Observers were better able to locate an inconsistent motion in spiral patterns than in deformation patterns, indicating that they were using more than just local motion information to find the target. This result is taken as indirect support for a segregation process that involves fitting the stimulus with a global motion pattern and segregating motions inconsistent with this pattern.
观察者观看稀疏随机点动态影像，其中移动的点被限制在八个窗口内。七个窗口中的运动与全局流动模式一致，而第八个窗口中的运动方向偏离了该模式。观察者的任务是确定八个窗口中哪一个包含不一致的运动。该任务针对两种全局流动模式进行：螺旋模式，看起来是刚性的；变形模式，看起来高度非刚性。尽管这些模式产生了质的不同的全局感知，但它们在局部速度和速度差异上完全匹配。观察者在螺旋模式中比在变形模式中更能定位不一致的运动，这表明他们在寻找目标时使用的不仅仅是局部运动信息。这一结果被视为对一种分离过程的间接支持，该过程涉及将刺激与全局运动模式进行匹配，并分离与该模式不一致的运动。
