Switkes E, Bradley A, Schor C
Department of Chemistry, University of California, Santa Cruz 95064.
Vision Res. 1990;30(9):1367-76. doi: 10.1016/0042-6989(90)90010-i.
In an earlier study (Wolfe & Owens, 1981) it was reported that humans could not accommodate to an insoluminant red-green border. However, recent masking studies (Switkes, Bradley & DeValois, 1988) have shown that, using an appropriately normalized contrast metric, contrast decrements similar to those produced by defocus are equally visible for color or luminance modulated grating patterns. We have compared accommodative responses to 1.75 c/deg gratings that consisted of either isochromatic luminance modulations or isoluminant red-green color modulations. All four observers could accommodate accurately to luminance modulated gratings over a wide range of contrasts. However, no appropriate accommodative responses were obtained even for the highest contrast color modulated gratings. These results show the changes in color contrast are ineffective as stimuli for the human accommodative response even when the changes in chromatic contrast accompanying defocus are readily perceived.
在早期的一项研究中（沃尔夫和欧文斯，1981年），据报道人类无法适应非发光的红绿色边界。然而，最近的掩蔽研究（斯维克斯、布拉德利和德瓦洛伊斯，1988年）表明，使用适当归一化的对比度度量，对于颜色或亮度调制的光栅图案，与散焦产生的对比度降低相似的对比度降低同样可见。我们比较了对由等色亮度调制或等亮度红绿色调制组成的1.75周/度光栅的调节反应。所有四名观察者都能在很宽的对比度范围内准确地适应亮度调制的光栅。然而，即使对于对比度最高的颜色调制光栅，也没有获得适当的调节反应。这些结果表明，即使散焦时伴随的颜色对比度变化很容易被察觉，颜色对比度的变化作为人类调节反应的刺激也是无效的。
