Yakimoff N
Acta Physiol Pharmacol Bulg. 1978;4(4):61-9.
Fifty subjects were asked to assign orientation to different configurations of bright dots by means of an adjustable long line. Their performance of the task clearly demonstrates that the assigned orientation of each configuration coincides with the orientation of a line drawn through the dot pattern so that the sum of the squared distances between each dot and this line is minimum. Such a line remains invariant in respect to rotation of the set of dots. It is concluded that perceived orientation of dot patterns in the plane is an invariant characteristic of this kind of visual stimulus.
五十名受试者被要求通过一条可调节的长线来为不同的亮点配置指定方向。他们在这项任务中的表现清楚地表明，每个配置所指定的方向与通过点图案绘制的线的方向一致，这样每个点与这条线之间的平方距离之和最小。这样一条线相对于点集的旋转保持不变。可以得出结论，平面中点图案的感知方向是这种视觉刺激的一个不变特征。
