Integration of color, orientation, and size functional domains in the ventral pathway.
Integration of color, orientation, and size functional domains in the ventral pathway.
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DOI：
10.1117/1.nph.4.3.031216
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发表时间：
2017-07
期刊：
影响因子：
5.3
通讯作者：
Ts'o DY
中科院分区：
文献类型：
--
作者：
Ghose GM;Ts'o DY
与视觉形式分析相关的腹侧通路的纹外区的功能特化知之甚少。比较早期视觉区域内神经元功能选择性的研究发现，区域之间的相似性大于差异性。我们同时成像视觉诱发激活的区域V2和V4和参数变化的三个视觉属性，其中选择性存在于这两个领域：颜色，方向和大小。我们发现，在这两个地区观察到的颜色选择区域，并具有相似的大小和空间分布。然而，观察到两个主要的区域差异：V4包含更多的数量和多样性的颜色特异性区域比V2和表现出更高程度的重叠不同的功能属性之间的域。在V2中，尺寸和颜色区域在很大程度上与取向域分离，而在V4中，颜色和尺寸区域与取向区域相当大地重叠。我们的研究结果表明，纹外皮质中的高阶复合选择性可能是由低阶选择性功能域重叠所提供的相互作用有机地产生的。
Functional specialization within the extrastriate areas of the ventral pathway associated with visual form analysis is poorly understood. Studies comparing the functional selectivities of neurons within the early visual areas have found that there are more similar than different between the areas. We simultaneously imaged visually evoked activation over regions of V2 and V4 and parametrically varied three visual attributes for which selectivity exists in both areas: color, orientation, and size. We found that color selective regions were observed in both areas and were of similar size and spatial distribution. However, two major areal distinctions were observed: V4 contained a greater number and diversity of color-specific regions than V2 and exhibited a higher degree of overlap between domains for different functional attributes. In V2, size and color regions were largely segregated from orientation domains, whereas in V4 both color and size regions overlapped considerably with orientation regions. Our results suggest that higher-order composite selectivities in the extrastriate cortex may arise organically from the interactions afforded by an overlap of functional domains for lower order selectivities.