Nundy Surajit, Purves Dale
Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA.
Proc Natl Acad Sci U S A. 2002 Oct 29;99(22):14482-7. doi: 10.1073/pnas.172520399. Epub 2002 Oct 18.
The perceptions of lightness or brightness elicited by a visual target are linked to its luminance by a nonlinear function that varies according to the physical characteristics of the target and the background on which it is presented. Although no generally accepted explanation of this scaling relationship exists, it has long been considered a byproduct of low- or mid-level visual processing. Here we examine the possibility that brightness scaling is actually the signature of a biological strategy for dealing with inevitably ambiguous visual stimuli, in which percepts of lightness/brightness are determined by the probabilistic relationship between luminances in the image plane and their possible real-world sources.
视觉目标所引发的亮度或明度感知，通过一个非线性函数与目标的亮度相关联，该函数会根据目标及其呈现背景的物理特征而变化。尽管目前尚无关于这种比例关系的普遍接受的解释，但长期以来它一直被视为低或中级视觉处理的副产品。在此，我们探讨亮度比例实际上是一种应对不可避免的模糊视觉刺激的生物学策略的标志的可能性，在这种策略中，亮度/明度感知由图像平面中的亮度与其可能的现实世界来源之间的概率关系决定。
