Detection of shape in radial frequency contours: Independence of local and global form information
Detection of shape in radial frequency contours: Independence of local and global form information
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DOI：
10.1016/j.visres.2007.01.006
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发表时间：
2007-05-01
期刊：
影响因子：
1.8
通讯作者：
Wilkinson, Frances
中科院分区：
文献类型：
--
作者：
Bell, Jason;Badcock, David R.;Wilkinson, Frances
径向频率（RF）模式已被用于研究与形状感知有关的过程。心理物理学文献表明，对于低和高径向频率模式，存在不同的全局和局部形状检测过程，但这尚未在组合轮廓模式中进行测试，例如描述大多数自然物体的轮廓所需的轮廓。在这里，我们将来自局部和全局范围的频率组合到复合RE结构上。测量了观察者在复合模式上检测单个稀土成分的能力。结果表明，对高频局部形状偏差的敏感性不受全局感知低频模式的影响。在相反的情况下，在结构上添加局部偏差不影响整体形式的检测。这表明局部和全局形状信息可以在人类视觉系统中独立检测到。(C) 2007 Elsevier Ltd.版权所有。
Radial frequency (RF) patterns have been used to study the processes involved in shape perception. The psychophysical literature suggests that there are distinct global and local shape detection processes for low and high radial frequency patterns, but this has not been tested in a combined contour pattern, such as would be needed to describe the contours of most natural objects. Here, we combined frequencies from the local and global range onto a compound RE structure. Observers' ability to detect a single RE component on the compound pattern was measured. Results show that sensitivity to high frequency local deviations in shape was not affected by the presence of a globally perceived low frequency pattern. In the reverse condition, detection of global form was not influenced by adding local deviations onto the structure. This suggests that local and global shape information can be detected independently within the human visual system. (C) 2007 Elsevier Ltd. All rights reserved.