Farrell J E, Shepard R N
J Exp Psychol Hum Percept Perform. 1981 Apr;7(2):477-86. doi: 10.1037//0096-1523.7.2.477.
Apparent rotational motion was investigated in polygonal shapes ranging in rotational symmetry from random to self-identical under 180 degrees rotation. Observers adjusted the rate of alternation between two computer-displayed orientations of any given polygon to determine the point of breakdown of perceived rigid rotation between those two orientations. For asymmetric polygons, the minimum stimulus-onset asynchrony yielding apparent rigid rotation increased approximately linearly with orientational disparity, as anticipated on the basis of the extension of Korte's third law to rotational motion by Shepard and Judd. For nearly symmetric polygons, however, the critical time increased markedly as the disparities approached 180 degrees, owing to the availability of a shorter, nonrigid rotation in the opposite direction. The results demonstrate the existence of competing mental tendencies to preserve the rigid structure of an object and to traverse a minimum transformational path.
研究了在180度旋转下，从随机到自相同旋转对称的多边形形状中的表观旋转运动。观察者调整任意给定多边形在计算机上显示的两个方向之间的交替速率，以确定这两个方向之间感知到的刚性旋转的崩溃点。对于不对称多边形，产生表观刚性旋转的最小刺激起始异步随着方向差异大致呈线性增加，这是基于谢泼德和贾德将科尔特第三定律扩展到旋转运动所预期的。然而，对于近乎对称的多边形，随着差异接近180度，临界时间显著增加，这是由于存在相反方向的较短的非刚性旋转。结果表明存在相互竞争的心理倾向，即保持物体的刚性结构和走最短的变换路径。
