Seeing circles: what limits shape perception?
Seeing circles: what limits shape perception?
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DOI：
10.1016/s0042-6989(00)00092-4
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发表时间：
2000-01-01
期刊：
影响因子：
1.8
通讯作者：
Klein, SA
中科院分区：
文献类型：
--
作者：
Levi, DM;Klein, SA
人类非常善于判断形状和区分形式。形式和形状最初是由离散的局部视觉过滤器（ol感受野）在视觉处理的“早期”阶段采样的。然而，可能需要整合来自许多局部滤波器的池信息的更复杂的更高级滤波器来辨别形状。为了理解限制形状感知的机制，我们要求观察者检测由样本构建的简要呈现的圆圈形状的扭曲（Gabor补丁，与早期的视觉过滤器很好地匹配），并改变圆圈的半径，以及样本的数量和方向。我们的研究结果表明，形状感知是由两个因素决定的。主要决定因素是样本之间的间隔，然而，样本的方向可以调节性能。在较小的间距下，当样本与全局形状对齐时性能最佳，当样本正交时性能较差，当样本全部水平或垂直时性能居中。在较大的分离度下，这些上下文差异消失;然而，在所有分离度下，当样本的方向混合时（即每个样本随机对齐或正交，或者随机水平或垂直），性能会降低。这些结果表明一个重要的作用，样本分离的形状感知采样的形状，并建议参与功能绑定的机制可能会调节形状感知的机制的反应。(C)2000爱思唯尔科技有限公司版权所有。
Humans are remarkably adept at judging shapes and discriminating forms. Forms and shapes are initially sampled by discrete localized visual filters (ol receptive fields) in 'early' stages of visual processing. However, more complex higher level filters which integrate ol pool information from many local filters may be needed to discern shapes. In order to understand the mechanisms that limit shape perception we asked observers to detect distortions in the shape of briefly presented circles constructed out of samples (Gabor patches, which are well matched to the early visual filters), and varied the radius of the circle, and the number and orientation of the samples. Our results show that shape perception is determined by two factors. the primary determinant is the separation between the samples, however, the orientation of the samples can modulate performance. At small separations, performance is best when the samples are aligned with the global shape, poorer when they are orthogonal, and intermediate when they ale all horizontal or vertical. At larger separations these contextual differences disappear; however at all separations, performance is reduced when the orientations of the samples are mixed (i.e. each sample is randomly either aligned or orthogonal, or randomly either horizontal or vertical.). These results suggest an important role for sample separation in shape perception for sampled shapes and suggest that the mechanisms involved in feature binding may modulate the responses of the mechanisms underlying shape perception. (C) 2000 Elsevier Science Ltd. All rights reserved.