Is there opponent-orientation coding in the second-order channels of pattern vision?
Is there opponent-orientation coding in the second-order channels of pattern vision?
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DOI：
10.1016/j.visres.2004.07.018
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发表时间：
2004-12-01
期刊：
影响因子：
1.8
通讯作者：
Wolfson, SS
中科院分区：
文献类型：
--
作者：
Graham, N;Wolfson, SS
在模式知觉中，方向选择过程之间是否存在类似于颜色机制之间的平行性？在这里，我们集中在可能的二阶通道的双折射。我们比较了几种可能的二阶结构：SIGN-opponent-only通道（也称为复杂通道或过滤-校正-过滤机制），其中方向之间没有重复性;我们将三种结构归类为ORIENTATION-opponent;最后是BOTH-opponent通道，它结合了SIGN-opponent-only和ORIENTATION-opponent通道的联合收割机特征，但导致的预测与它们中的任何一个都不同。我们测量观察者的能力，分离纹理组成的棋盘和条纹安排的垂直和水平的Gabor光栅补丁。观察员的表现进行了比较，从替代对手结构的模型预测。实验结果与仅SIGN对手通道一致。结果排除了定向-对手和双方-对手结构。此外，当模型扩展到包括对比度增益控制（归一化网络中通道之间的抑制）时，仅SIGN对手模型也能够解释我们发现的对比度依赖效应，从而提供了另一个证据，证明这种归一化是人类纹理感知中的一个重要过程。(C)2004爱思唯尔有限公司保留所有权利。
Is there opponency between orientation-selective processes in pattern perception, analogous to opponency between color mechanisms? Here we concentrate on possible opponency in second-order channels. We compare several possible second-order structures: SIGN-opponent-only channels in which there is no opponency between orientations (also called complex channels or filter-rectify-filter mechanisms); three structures we group under the name ORIENTATION-opponent; and finally BOTH-opponent channels which combine features of both SIGN-opponent-only and ORIENTATION-opponent channels but lead to predictions that are distinct from either of theirs. We measured observers' ability to segregate textures composed of checkerboard and striped arrangements of vertical and horizontal Gabor grating patches. The observers' performance was compared to model predictions from the alternative opponent structures. The experimental results are consistent with SIGN-opponent-only channels. The results rule out the ORIENTATION-opponent and BOTH-opponent structures. Further, when the models were expanded to include a contrast gain-control (inhibition among channels in a normalization network) the SIGN-opponent-only model was also able to explain a contrast-dependent effect we found, thus providing another piece of evidence that such normalization is an important process in human texture perception. (C) 2004 Elsevier Ltd. All rights reserved.