Local computation of lightness on articulated surrounds.
Local computation of lightness on articulated surrounds.
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作者：
Sawayama M;Kimura E
均匀亮（或暗）环绕上的灰色目标的亮度通过清晰环绕（清晰效果）而改变。为了阐明清晰度效果背后的亮度处理，本研究在黑暗周围引入了透明度，并研究了其对目标亮度的影响。透明度是通过在黑暗周围添加连续的外部场同时保持局部刺激配置不变而产生的。结果表明，当在目标上方感知到深色透明滤光片时，铰接式环绕件上的目标亮度不会发生变化，但在均匀环绕件上会发生变化。这些结果表明，如果表面是铰接的，则图像分解为透明滤光器和下面的表面不一定会改变表面的亮度。此外，目前的研究表明，清晰的环绕并不总是能增强亮度对比度；当目标亮度不是周围环境中最高时，它可以降低对比度效果。这些发现与铰接表面上的亮度感知是在空间有限区域内局部确定的理论观点一致，并且它们还对如何缩放有限区域内的亮度分布施加了约束。
Lightness of a grey target on a uniform light (or dark) surround changes by articulating the surround (articulation effect). To elucidate the processing of lightness underlying the articulation effect, the present study introduced transparency over a dark surround and investigated its effects on lightness of the target. The transparency was produced by adding a contiguous external field to the dark surround while keeping local stimulus configuration constant. Results showed that the target lightness did not change on the articulated surround when a dark transparent filter was perceived over the target, although it did on the uniform surround. These results suggest that image decomposition into a transparent filter and an underlying surface does not necessarily change lightness of the surface if the surface is articulated. Moreover, the present study revealed that articulating the surround does not always enhance lightness contrast; it can reduce the contrast effect when the target luminance is not the highest within the surround. These findings are consistent with the theoretical view that lightness perception on articulated surfaces is determined locally within a spatially limited region, and they also place a constraint on how the luminance distribution within the limited region is scaled.
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影响因子：
8.2
作者：
Rutherford, MD;Brainard, DH
通讯作者：
Brainard, DH
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1.8
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1.7
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影响因子：
--
作者：
HEINEMANN, EG
通讯作者：
HEINEMANN, EG
影响因子：
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作者：
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通讯作者：
WALLACH, H