Bäuml K H
Institut für Psychologie, Universität Regensburg, Germany.
Percept Psychophys. 1993 Mar;53(3):338-44. doi: 10.3758/bf03205188.
There is strong empirical evidence that, under adaptation to another achromatic color stimulus, the lightness of an achromatic color stimulus depends on the ratio of the luminances of the two stimuli. In the present study, the suitability of this ratio principle is tested for two chromatic postreceptoral opponent channels. A Hering red/green channel and a non-Hering yellow/blue channel are specified as chromatic channels. The yellow/blue channel is defined by extrapolating the plane corresponding to unique green-white linearly to the reddish part of color space, using the plane's surface as the channel's equilibria. The experiment was run on an isoluminant plane, measured individually for each observer. Moving along an observer's measured opponent axes, eight adaptation stimuli were selected for each channel and spanned the whole range of the channel's coordinates. Red/green equilibria or yellow/blue equilibria were measured as excursions along the adaptation axes. For both presumed channels, the ratios of the equilibrium coordinates of test and adaptation stimuli were essentially constant. This supports the principle's suitability. However, small asymmetries were found with respect to each channel's opponent hues. The status of the proposed yellow/blue channel is discussed, as are conditions that might have favored the present findings.
有强有力的实证证据表明，在适应另一种非彩色颜色刺激时，非彩色颜色刺激的明度取决于两种刺激的亮度比。在本研究中，针对两个彩色感受器后对立通道测试了该比例原则的适用性。将一个赫林红/绿通道和一个非赫林黄/蓝通道指定为彩色通道。黄/蓝通道是通过将对应于唯一绿-白的平面线性外推到颜色空间的红色部分来定义的，使用该平面的表面作为通道的平衡点。实验在一个等亮度平面上进行，为每个观察者单独测量。沿着观察者测量的对立轴移动，为每个通道选择了八个适应刺激，并跨越了通道坐标的整个范围。红/绿平衡点或黄/蓝平衡点作为沿着适应轴的偏移量进行测量。对于两个假定的通道，测试刺激和适应刺激的平衡坐标之比基本恒定。这支持了该原则的适用性。然而，发现相对于每个通道的对立色调存在小的不对称性。讨论了所提出的黄/蓝通道的状况以及可能有利于当前研究结果的条件。
