Linnell Karina J, Foster David H
Behavioural Brain Sciences, School of Psychology, University of Birmingham, UK.
Perception. 2002;31(2):151-9. doi: 10.1068/p03sp.
The ability of observers to detect changes in illuminant over two scenes containing different random samples of reflecting surfaces was determined in an experiment with Mondrian-like patterns containing different numbers of coloured patches. Performance was found to improve as the number of patches increased from 9 to 49. In principle, observers could have used space-average scene colour as the cue ('grey-world' hypothesis) or the colour of the brightest surface in the scene ('bright-is-white' hypothesis), as the two cues generally covary. In a second experiment, observers matched illuminants across different patterns in which the space-average cue and the brightest-patch cue were independently manipulated. The articulation of the patterns was varied: the number of patches increased from 49 (patch width 1 deg visual angle) to over 50000 (patch width 0.03 deg), while the gamut of colours was held constant. Space-average colour was found to be the dominant cue with all patterns except for those with the largest patches.
在一项实验中，通过包含不同数量彩色斑块的类似蒙德里安图案，测定了观察者在包含不同反射表面随机样本的两个场景中检测光源变化的能力。结果发现，随着斑块数量从9个增加到49个，表现有所改善。原则上，观察者可以使用空间平均场景颜色作为线索（“灰色世界”假说）或场景中最亮表面的颜色（“亮即白”假说），因为这两个线索通常是共变的。在第二个实验中，观察者在不同图案之间匹配光源，其中空间平均线索和最亮斑块线索被独立操纵。图案的清晰度有所变化：斑块数量从49个（斑块宽度为1度视角）增加到超过50000个（斑块宽度为0.03度），而色域保持不变。结果发现，除了那些斑块最大的图案外，空间平均颜色是所有图案的主导线索。
