Albert M K
Vision Sciences Laboratory, Harvard University, Cambridge, MA 02138, USA.
Perception. 1998;27(7):839-49. doi: 10.1068/p270839.
If the mouths of the pacmen of a Kanizsa square are colored, for example red, then an illusory red transparent square is seen. In many visual theories such 'neon color spreading' is explained by assimilation of chromatic and achromatic color. In this paper the achromatic case was investigated. In a two-alternative forced-choice task thirty observers judged the brightness of achromatic neon figures. The results suggest that assimilation of achromatic color inside and/or outside of the illusory figures cannot explain the brightness effects seen in achromatic neon color spreading. Although these displays may produce assimilation, it appears that contrast (perhaps acting nonlocally) is a stronger influence on their perceived brightness.
如果卡尼萨方块（Kanizsa square）中“吃豆人”的嘴巴被涂上颜色，比如红色，那么就会看到一个虚幻的红色透明方块。在许多视觉理论中，这种“霓虹色扩散”现象是通过彩色与非彩色的同化来解释的。在本文中，对非彩色的情况进行了研究。在一个二选一的强制选择任务中，30名观察者判断非彩色霓虹图形的亮度。结果表明，虚幻图形内部和/或外部非彩色的同化并不能解释在非彩色霓虹色扩散中看到的亮度效应。虽然这些显示可能会产生同化现象，但似乎对比度（可能以非局部方式起作用）对其感知亮度的影响更强。
