Representation of color, form, and their conjunction across the human ventral visual pathway.
Representation of color, form, and their conjunction across the human ventral visual pathway.
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DOI：
10.1016/j.neuroimage.2022.118941
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发表时间：
2022-05-01
期刊：
影响因子：
5.7
通讯作者：
Xu, Yaoda
中科院分区：
文献类型：
--
作者：
Taylor, JohnMark;Xu, Yaoda
尽管进行了数十年的研究，但我们对灵长类动物腹视觉途径中颜色和形式处理之间关系的理解仍然不完整。使用fMRI多毒素模式分析，我们在人腹视觉处理区域中使用了简单的形式特征（方向）和中层形式（曲率）检查了颜色和形式的编码。我们发现，颜色和形式都可以从早期视觉区域V1的活动中解码到V4，以及在腹侧和外侧枕颞皮质中的后颜色选择区域以及形状选择区域，这些区域根据其对颜色或颜色或颜色的单变量选择性定义。形状分别（中心颜色区域仅显示颜色，但不形成解码）。同时，在颜色和形状选择区域中存在对一个特征或另一个特征的偏见，与过去研究中报道的单变量特征选择性一致。其他广泛的分析表明，尽管所有这些区域都包含这两个功能的独立（线性添加）编码，但几个早期的视觉区域还以非线性的交互式方式编码了颜色的连词，而简单但不是复杂的形式。综上所述，结果表明，颜色和形式是在人脑的腹侧视觉区域中以偏见的分布和独立方式编码的。
Despite decades of research, our understanding of the relationship between color and form processing in the primate ventral visual pathway remains incomplete. Using fMRI multivoxel pattern analysis, we examined coding of color and form, using a simple form feature (orientation) and a mid-level form feature (curvature), in human ventral visual processing regions. We found that both color and form could be decoded from activity in early visual areas V1 to V4, as well as in the posterior color-selective region and shape-selective regions in ventral and lateral occipitotemporal cortex defined based on their univariate selectivity to color or shape, respectively (the central color region only showed color but not form decoding). Meanwhile, decoding biases towards one feature or the other existed in the color- and shape-selective regions, consistent with their univariate feature selectivity reported in past studies. Additional extensive analyses show that while all these regions contain independent (linearly additive) coding for both features, several early visual regions also encode the conjunction of color and the simple, but not the complex, form feature in a nonlinear, interactive manner. Taken together, the results show that color and form are encoded in a biased distributed and largely independent manner across ventral visual regions in the human brain.
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