A common light-prior for visual search, shape, and reflectance judgments
A common light-prior for visual search, shape, and reflectance judgments
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DOI：
10.1167/7.11.11
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发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
Adams, Wendy J.
中科院分区：
文献类型：
--
作者：
Adams, Wendy J.
调用“上方光”先验来简化和加速复杂的视觉处理。这种先验是在带有阴影刺激的视觉搜索和形状判断中观察到的，其中感知的形状和目标识别的难易程度都受到刺激方向的影响。此外，感知的表面反射率随表面方向的变化而变化，其方式与假设的头顶照明一致。这些不同任务所表现出的光先验是否具有相同的潜在机制甚至照明方向？一些证据表明，“左上方”而不是“上方”先验可以指导某些任务中的行为，但不能指导其他任务中的行为。在当前的研究中，“来自上方的光”先验是使用视觉搜索、形状感知和新颖的反射判断任务来测量的。观察者之间存在显着差异。然而，使用所有三个任务测量的光先验之间发现了很强的正相关性。这些数据表明，单一机制负责“快速而肮脏”的视觉搜索行为、形状感知和反射率判断中的来自上方的光先验。此外，数据支持这样的观点：感知形状是带有阴影目标的视觉搜索中的前注意特征。
The "light-from-above" prior is invoked to simplify and expedite complex visual processing. This prior is observed in visual search and shape judgments with shaded stimuli, where perceived shape and ease of target identification are both affected by stimulus orientation. In addition, perceived surface reflectance varies with surface orientation in a manner consistent with assumed overhead lighting. Do the light-priors exhibited by these different tasks have the same underlying mechanism or even lighting direction? Some evidence has suggested that an "above-left" rather than "above" prior guides behavior in some tasks, but not others. In the current study, the "light-from-above" prior was measured using visual search, shape perception, and a novel reflectance-judgment task. There were substantial differences between observers. However, strong positive correlations were found between the light-priors measured using all three tasks. The data imply that a single mechanism is responsible for a light-from-above prior in "quick and dirty" visual search behavior, shape perception, and reflectance judgments. Furthermore, the data support the notion that perceived shape is the preattentive feature in visual search with shaded targets.