Gheorghiu Elena, Kingdom Frederick A A
Laboratory of Experimental Psychology, University of Leuven, Leuven, Belgium.
J Vis. 2012 Jun 12;12(6):16. doi: 10.1167/12.6.16.
Contour-shape coding is color selective (Gheorghiu & Kingdom, 2007a) and surround textures inhibit the processing of contour shapes (Gheorghiu & Kingdom, 2011; Kingdom & Prins, 2009). These two findings raise two questions: (1) is texture-surround suppression of contour shape color selective, and (2) is texture-shape processing color selective? To answer these questions, we measured the shape-frequency aftereffect using contours constructed from strings of Gabors defined along the red-green, blue-yellow, and luminance axes of cardinal color space. The stimuli were either single sinusoidal-shaped contours or textures made of sinusoidal-shaped contours arranged in parallel. We measured aftereffects for (A) single-contour adaptors and single-contour tests defined along the same versus different cardinal directions, (B) texture adaptors and single-contour tests in which the central-adaptor contour/single-contour test and surround adaptor contours were defined along the same versus different cardinal directions, and (C) texture adaptors and texture tests defined along same versus different cardinal directions. We found that color selectivity was most prominent for contour-shape processing, weaker for texture-surround suppression of contour-shape processing, and absent for texture-shape processing.
轮廓形状编码具有颜色选择性（Gheorghiu和Kingdom，2007a），并且周边纹理会抑制轮廓形状的处理（Gheorghiu和Kingdom，2011；Kingdom和Prins，2009）。这两个发现提出了两个问题：（1）纹理周边对轮廓形状的抑制是否具有颜色选择性？（2）纹理形状处理是否具有颜色选择性？为了回答这些问题，我们使用由沿基本颜色空间的红-绿、蓝-黄和亮度轴定义的一系列Gabors构成的轮廓来测量形状频率后效。刺激物要么是单个正弦形状的轮廓，要么是由平行排列的正弦形状轮廓组成的纹理。我们测量了以下几种情况下的后效：（A）沿相同或不同基本方向定义的单轮廓适应刺激和单轮廓测试；（B）纹理适应刺激和单轮廓测试，其中中央适应轮廓/单轮廓测试和周边适应轮廓沿相同或不同基本方向定义；以及（C）沿相同或不同基本方向定义的纹理适应刺激和纹理测试。我们发现，颜色选择性在轮廓形状处理中最为显著，在轮廓形状处理的纹理周边抑制中较弱，而在纹理形状处理中不存在。
