Perotti V J, Todd J T, Norman J F
Department of Psychology, Ohio State University, Columbus 43210, USA.
Percept Psychophys. 1996 Jul;58(5):666-79. doi: 10.3758/bf03213099.
Four experiments investigated observers' judgments of rigidity for different types of optical motion. The depicted structural deformations were of two types: (1) those with nonparallel image trajectories that are detectable from the first-order spatiotemporal relations between pairs of views; and (2) those with parallel image trajectories that can only be detected from higher order relations among three or more views. Patterns were composed of smooth flow fields in Experiments 1 and 3, and of wire frame figures in Experiments 2 and 4. For both types of display, the nonrigidity detectable from the first-order spatiotemporal structure of the motion sequence was much more salient than the deformation detectable only from the higher order spatiotemporal structure. These results indicate that observers' judgments of rigidity are based primarily on a two-view analysis, but that some useful information can be obtained under appropriate circumstances from higher order spatiotemporal relations among three or more views.
四项实验研究了观察者对不同类型光学运动的刚性判断。所描绘的结构变形有两种类型：（1）具有不平行图像轨迹的变形，可从成对视图之间的一阶时空关系中检测到；（2）具有平行图像轨迹的变形，只能从三个或更多视图之间的高阶关系中检测到。在实验1和3中，图案由平滑流场组成，在实验2和4中，图案由线框图形组成。对于这两种类型的显示，从运动序列的一阶时空结构中可检测到的非刚性比仅从高阶时空结构中可检测到的变形更为显著。这些结果表明，观察者的刚性判断主要基于双视图分析，但在适当情况下，也可以从三个或更多视图之间的高阶时空关系中获得一些有用信息。
