Integration of local pattern elements into a global shape in human vision.
Integration of local pattern elements into a global shape in human vision.
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将局部图案元素融入人类视觉中的全局形状。
DOI：
10.1073/pnas.94.15.8267
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发表时间：
1997
影响因子：
11.1
通讯作者：
Shen,B
中科院分区：
文献类型：
--
作者：
Saarinen,J;Levi,DM;Shen,B
对于不同的空间频率和方位，皮质滤光片的空间选择性是有限的。我们从心理物理上研究了来自局部过滤器的信息如何整合到全局模式形状中，即，在识别由小的、局部定向的Gabor元素组成的全局模式时，性能是否取决于这些元素的方向。观察者被呈现出一个由空白背景上的定向Gabor块组成的E-like刺激图案形状，性能度量是用于识别E图案方向的阈值对比度(四个可能的旋转方向)。结果表明，与元素具有混合取向(水平和垂直)的情况相比，当局部元素都具有相同的取向(例如，全部水平)时，对比阈值显著降低。由均匀局部取向引起的增强效应可以用两个因素来解释：一个是方向选择滤光片之间的局部促进作用，另一个是滤光片上的二阶信息整合。
The spatial extent of the cortical filters selective for different spatial frequencies and orientations is limited. We studied psychophysically how information from the local filters is integrated into global pattern shapes, i.e., whether performance in the identification of a global pattern consisting of small, locally oriented Gabor elements depends on the orientations of those elements. The observer was presented with an E-like stimulus pattern shape comprised of oriented Gabor patches on a blank background, and the performance measure was the threshold contrast for identifying the orientation of the E pattern (four possible rotated orientations). The results showed that contrast thresholds were significantly lower when the local elements all shared the same orientation (e.g., all horizontal) compared with the condition in which the elements had mixed orientations (both horizontal and vertical). The enhancement effect due to uniform local orientations can be explained by two factors: One is local facilitatory interactions between the orientation selective filters, and the other is second-order information integration across the filters.