Mullen K T
Physiological Laboratory, University of Cambridge, U.K.
Vision Res. 1991;31(1):119-30. doi: 10.1016/0042-6989(91)90079-k.
The experiments address the question whether there is evidence that the central visual field is any more specialized for colour than it is for luminance contrast detection. The decline in contrast sensitivity across the visual field for colour-only (red-green) gratings is compared to that for monochromatic luminance gratings at a range of spatial frequencies in the nasal and temporal fields. Measurements are made of the chromatic spatial summation area and the relevant parts of the chromatic temporal contrast sensitivity function at different eccentricities in order to control for their influence on the decline in contrast sensitivity. Results show that at each spatial frequency colour contrast sensitivity declines with eccentricity approximately twice as steeply as luminance contrast sensitivity. The more rapid decline in colour contrast sensitivity than luminance contrast sensitivity across the visual field reveals that chromatic mechanisms are more confined than luminance mechanisms to the central field.
这些实验探讨了是否有证据表明，中央视野在颜色方面比在亮度对比度检测方面更加专门化。将仅颜色（红-绿）光栅在整个视野中对比度敏感度的下降情况，与在鼻侧和颞侧视野一系列空间频率下单色亮度光栅的对比度敏感度下降情况进行比较。测量了不同偏心度下的色度空间总和区域以及色度时间对比度敏感度函数的相关部分，以控制它们对对比度敏感度下降的影响。结果表明，在每个空间频率下，颜色对比度敏感度随偏心度下降的速度大约是亮度对比度敏感度的两倍。整个视野中颜色对比度敏感度比亮度对比度敏感度下降得更快，这表明色度机制比亮度机制更局限于中央视野。
