Revealing Detail along the Visual Hierarchy: Neural Clustering Preserves Acuity from V1 to V4
Revealing Detail along the Visual Hierarchy: Neural Clustering Preserves Acuity from V1 to V4
复制标题
沿视觉层次结构揭示细节：神经聚类保持 V1 到 V4 的敏锐度。
DOI：
10.1016/j.neuron.2018.03.009
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发表时间：
2018-04-18
期刊：
影响因子：
16.2
通讯作者：
Wang, Wei
中科院分区：
文献类型：
--
作者：
Lu, Yiliang;Yin, Jiapeng;Wang, Wei
灵长类动物如何感知物体及其详细特征仍然是一个谜。这种进行精细视觉辨别的能力取决于从V1到颞下皮层的视觉层级对空间频率（SF）的高敏锐度分析。通过研究猕猴中央凹旁V1、V2和V4区域空间频率的转换，我们在V4中发现了对高达12周/度的较高空间频率进行编码的空间频率选择性功能域。这些间歇性的较高空间频率选择性区域被编码较低空间频率的区域所环绕，这违反了空间频率偏好与视网膜离心率之间的反比关系。较高和较低空间频率区域的神经活动分别对应于相同刺激的局部和全局特征。高空间频率区域的神经反应潜伏期比低空间频率区域大约晚10毫秒，这与感知从粗到细的特性是一致的。因此，我们发现从V1到V4在空间和时间上分离但分辨率得以保留，这可能为物体的详细表征提供了一个连接环节。
How primates perceive objects along with their detailed features remains a mystery. This ability to make fine visual discriminations depends upon a high-acuity analysis of spatial frequency (SF) along the visual hierarchy from V1 to inferotemporal cortex. By studying the transformation of SF across macaque parafoveal V1, V2, and V4, we discovered SF-selective functional domains in V4 encoding higher SFs up to 12 cycles/degrees. These intermittent higher-SF-selective domains, surrounded by domains encoding lower SFs, violate the inverse relationship between SF preference and retinal eccentricity. The neural activities of higher-and lower-SF domains correspond to local and global features, respectively, of the same stimuli. Neural response latencies in high-SF domains are around 10 ms later than in low-SF domains, consistent with the coarse-to-fine nature of perception. Thus, our finding of preserved resolution from V1 into V4, separated both spatially and temporally, may serve as a connecting link for detailed object representation.