Tansley B W, Boynton R M
Science. 1976 Mar 5;191(4230):954-7. doi: 10.1126/science.1082644.
When observers are asked to rate the visual distinctness of borders formed by the junction of two photic stimuli, normal trichromatic subjects behave in a manner similar to that of tritanopes in a color mixture experiment. All stimuli that look the same to the tritanope produce the same border distinctness with any other stimulus. Sets of such stimuli, whose members do not form borders with each other, map as single points along a curved line, where the Euclidean distance between pairs of points representing the two stimuli is nearly proportional to the rated distinctness of the border formed between them. In the absence of luminance differences, the perception of contour apparently depends on the stimulation of only two cone types.
当要求观察者对由两种光刺激交界处形成的边界的视觉清晰度进行评分时，正常三色视觉者的表现方式类似于在颜色混合实验中的蓝色盲者。所有对蓝色盲者看起来相同的刺激与任何其他刺激产生相同的边界清晰度。这样的刺激集，其成员彼此不形成边界，沿着一条曲线映射为单个点，其中代表两种刺激的点对之间的欧几里得距离几乎与它们之间形成的边界的评分清晰度成正比。在没有亮度差异的情况下，轮廓的感知显然仅取决于两种视锥细胞类型的刺激。
