Mullen K T
J Physiol. 1985 Feb;359:381-400. doi: 10.1113/jphysiol.1985.sp015591.
A method of producing red-green and blue-yellow sinusoidal chromatic gratings is used which permits the correction of all chromatic aberrations. A quantitative criterion is adopted to choose the intensity match of the two colours in the stimulus: this is the intensity ratio at which contrast sensitivity for the chromatic grating differs most from the contrast sensitivity for a monochromatic luminance grating. Results show that this intensity match varies with spatial frequency and does not necessarily correspond to a luminance match between the colours. Contrast sensitivities to the chromatic gratings at the criterion intensity match are measured as a function of spatial frequency, using field sizes ranging from 2 to 23 deg. Both blue-yellow and red-green contrast sensitivity functions have similar low-pass characteristics, with no low-frequency attenuation even at low frequencies below 0.1 cycles/deg. These functions indicate that the limiting acuities based on red-green and blue-yellow colour discriminations are similar at 11 or 12 cycles/deg. Comparisons between contrast sensitivity functions for the chromatic and monochromatic gratings are made at the same mean luminances. Results show that, at low spatial frequencies below 0.5 cycles/deg, contrast sensitivity is greater to the chromatic gratings, consisting of two monochromatic gratings added in antiphase, than to either monochromatic grating alone. Above 0.5 cycles/deg, contrast sensitivity is greater to monochromatic than to chromatic gratings.
采用了一种生成红绿色和蓝黄色正弦形彩色光栅的方法，该方法可校正所有色差。采用定量标准来选择刺激中两种颜色的强度匹配：即彩色光栅的对比敏感度与单色亮度光栅的对比敏感度差异最大时的强度比。结果表明，这种强度匹配随空间频率而变化，并不一定对应于颜色之间的亮度匹配。在标准强度匹配下，测量彩色光栅的对比敏感度随空间频率的变化，使用的视场大小范围为2至23度。蓝黄色和红绿色对比敏感度函数都具有类似的低通特性，即使在低于0.1周/度的低频下也没有低频衰减。这些函数表明，基于红绿色和蓝黄色颜色辨别能力的极限敏锐度在11或12周/度时相似。在相同的平均亮度下，对彩色光栅和单色光栅的对比敏感度函数进行了比较。结果表明，在低于0.5周/度的低空间频率下，由两个反相相加的单色光栅组成的彩色光栅的对比敏感度高于任何一个单色光栅。在高于0.5周/度时，单色光栅的对比敏感度高于彩色光栅。
