Smith V C, Jin P Q, Pokorny J
Visual Sciences Center, The University of Chicago, Chicago, IL 60637, USA.
Vision Res. 2001 Apr;41(8):1007-21. doi: 10.1016/s0042-6989(01)00031-1.
Color induction was measured for test and inducing chromaticities presented in spatial square-wave alternation, with spatial frequencies of 0.7, 4.0, 6.0 and 9.0 cpd. Observers matched the test chromaticities to a rectangular matching field using haploscopic presentation. Data were collected and analyzed within the framework of a cone chromaticity space, allowing analysis of spatial frequency effects on post-receptoral spectral opponent pathways. Assimilation, a shift of chromaticity toward the inducing chromaticity, was found at the highest spatial frequency (9.0 cpd). Contrast, a shift of chromaticity away from the inducing chromaticity, occurred at the lowest spatial frequency (0.7 cpd). The spatial frequency at the transition point from assimilation to contrast was near 4 cpd, independent of the cone axis. Assimilation was unaffected by the presence of a neutral surround and could be described by a spread light model. Contrast was reduced in the presence of a neutral surround. The data suggested that retinal contrast signals are important determinants in the perception of chromatic contrast.
在空间方波交替呈现的情况下，测量了测试色度和诱导色度的颜色诱导，空间频率分别为0.7、4.0、6.0和9.0周/度。观察者使用双眼分视呈现方式，将测试色度与一个矩形匹配场进行匹配。数据是在锥体色度空间的框架内收集和分析的，这使得能够分析空间频率对感受器后光谱拮抗通路的影响。在最高空间频率（9.0周/度）时发现了同化现象，即色度向诱导色度的偏移。在最低空间频率（0.7周/度）时出现了对比现象，即色度远离诱导色度的偏移。从同化到对比的转变点处的空间频率接近4周/度，与锥体轴无关。同化不受中性背景的影响，并且可以用扩展光模型来描述。在有中性背景的情况下，对比会降低。数据表明，视网膜对比信号是颜色对比感知中的重要决定因素。
