Roesch S, Fry G A
Am J Optom Physiol Opt. 1980 Jul;57(7):433-9. doi: 10.1097/00006324-198007000-00005.
Ives found that when monochromatic stimuli are matched to white by flicker photometry, they are not equal in brightness to the white by direct comparison, and the discrepancy is minimal for yellow but is increased for longer and shorter wavelengths. On the two sides of yellow, the colors are more saturated, and Ives postulated that brightness involves the sum of a chromatic component and an achromatic component and that the chromatic component varies with the saturation. In the case of a deuteranope, one would expect a vigorous chromatic response for yellow and blue stimuli but a poor response for the neutral part of the spectrum. The Ives effect is virtually nonexistent for subject SR, who is a deuteranope. In terms of the zone theory of color vision, this would mean that the blue-yellow chromatic channel contributes little or nothing to brightness. In a normal observer, the blue-yellow mechanism can be isolated by using blues and yellows depurified with white, but in this case the Ives effect is found to exist.
艾夫斯发现，当通过闪烁光度法将单色刺激与白色匹配时，通过直接比较，它们在亮度上与白色并不相等，这种差异对于黄色最小，但对于更长和更短的波长会增加。在黄色两侧，颜色更饱和，艾夫斯推测亮度涉及一个色度成分和一个非色度成分的总和，并且色度成分随饱和度而变化。对于一个绿色盲患者，人们会预期对黄色和蓝色刺激有强烈的色度反应，但对光谱的中性部分反应较差。对于绿色盲患者SR来说，艾夫斯效应几乎不存在。根据色觉的区域理论，这意味着蓝黄色度通道对亮度的贡献很小或没有贡献。在正常观察者中，蓝黄机制可以通过使用用白色净化过的蓝色和黄色来分离，但在这种情况下发现存在艾夫斯效应。
