Testing the role of luminance edges in White's illusion with contour adaptation
Testing the role of luminance edges in White's illusion with contour adaptation
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DOI：
10.1167/15.11.14
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发表时间：
2015-01-01
影响因子：
1.8
通讯作者：
Maertens, Marianne
中科院分区：
文献类型：
--
作者：
Betz, Torsten;Shapley, Robert;Maertens, Marianne
怀特的错觉是一种感知效应，即叠加在黑白方波光栅上的两个同等亮度的灰色斑块在亮度上表现不同：放置在光栅暗条纹上的测试斑块看起来比放置在浅色条纹上的测试斑块更亮。尽管效果不依赖于测试贴片的长宽比，因此也不依赖于与深色或浅色条纹共享的边框的数量，但是每个贴片的上下文必须以一种尚未指定的方式影响它们的亮度。我们采用了轮廓适应范式（Anstis, 2013）来测试每个测试补丁的边缘对测试补丁感知亮度的贡献。我们发现，适应与光栅平行的边缘略微增加了亮度错觉，而适应正交边缘则消除了亮度错觉，对一些观察者来说甚至是逆转了亮度错觉。我们在三种亮度感知的空间滤波模型中实现了时间适应机制，并表明这些模型不能解释观测到的适应效应。我们得出结论，怀特的错觉很大程度上是由与光栅正交的边缘的边缘对比度决定的，而平行边缘的影响很小或没有影响。我们提出了可以解释这种不对称的机制。
White's illusion is the perceptual effect that two equiluminant gray patches superimposed on a black-and-white square-wave grating appear different in lightness: A test patch placed on a dark stripe of the grating looks lighter than one placed on a light stripe. Although the effect does not depend on the aspect ratio of the test patches, and thus on the amount of border that is shared with either the dark or the light stripe, the context of each patch must, in a yet to be specified way, influence their lightness. We employed a contour adaptation paradigm (Anstis, 2013) to test the contribution of each of the test patches' edges to the perceived lightness of the test patches. We found that adapting to the edges that are oriented parallel to the grating slightly increased the lightness illusion, whereas adapting to the orthogonal edges abolished, or for some observers even reversed, the lightness illusion. We implemented a temporal adaptation mechanism in three spatial filtering models of lightness perception, and show that the models cannot account for the observed adaptation effects. We conclude that White's illusion is largely determined by edge contrast across the edge orthogonal to the grating, whereas the parallel edge has little or no influence. We suggest mechanisms that could explain this asymmetry.