Devinck Frédéric, Spillmann Lothar, Werner John S
Section of Neurobiology, Physiology & Behavior, Department of Ophthalmology & Vision Science, University of California, Davis, Sacramento, California, USA.
Vis Neurosci. 2006 May-Aug;23(3-4):573-7. doi: 10.1017/S0952523806233224.
Color induction was measured using a matching method for two spatial patterns, each composed of double contours. In one pattern (the standard), the contours had sharp edges to induce the Watercolor Effect (WCE); in the other, the two contours had a spatial taper so that the overall profile produced a sawtooth edge, or ramped stimulus. These patterns were chosen based on our previous study demonstrating that the strength of the chromatic WCE depends on a luminance difference between the two contours. Low-pass chromatic mechanisms, unlike bandpass luminance mechanisms, may be expected to be insensitive to the difference between the two spatial profiles. The strength of the watercolor spreading was similar for the two patterns at narrow widths of the contour possibly because of chromatic aberration, but with wider contours, the standard stimulus produced stronger assimilation than the ramped stimulus. This research suggests that luminance-dependent chromatic mechanisms mediate the WCE and that these mechanisms are sensitive to differences in the two spatial profiles of the pattern contours only when they are wide.
使用匹配法测量两种空间模式的颜色诱导，每种模式均由双轮廓组成。在一种模式（标准模式）中，轮廓具有尖锐边缘以诱发水彩效应（WCE）；在另一种模式中，两条轮廓具有空间渐变，使得整体轮廓产生锯齿状边缘或斜坡状刺激。选择这些模式是基于我们之前的研究，该研究表明彩色WCE的强度取决于两条轮廓之间的亮度差异。与带通亮度机制不同，低通彩色机制可能对两种空间轮廓之间的差异不敏感。在轮廓宽度较窄时，两种模式的水彩扩散强度相似，这可能是由于色差所致，但在轮廓较宽时，标准刺激产生的同化作用比斜坡状刺激更强。这项研究表明，依赖亮度的彩色机制介导了WCE，并且这些机制仅在轮廓较宽时才对模式轮廓的两种空间轮廓差异敏感。
