Department of Neurosurgery of the Second Affiliated Hospital, Interdisciplinary Institute of Neuroscience and Technology, School of Medicine, Zhejiang University, Hangzhou, China.
Key Laboratory of Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China.
Elife. 2023 Jan 6;12:e81794. doi: 10.7554/eLife.81794.
Spatial frequency (SF) is an important attribute in the visual scene and is a defining feature of visual processing channels. However, there remain many unsolved questions about how extrastriate areas in primate visual cortex code this fundamental information. Here, using intrinsic signal optical imaging in visual areas of V2 and V4 of macaque monkeys, we quantify the relationship between SF maps and (1) visual topography and (2) color and orientation maps. We find that in orientation regions, low to high SF is mapped orthogonally to orientation; in color regions, which are reported to contain orthogonal axes of color and lightness, low SFs tend to be represented more frequently than high SFs. This supports a population-based SF fluctuation related to the 'color/orientation' organizations. We propose a generalized hypercolumn model across cortical areas, comprised of two orthogonal parameters with additional parameters.
空间频率(SF)是视觉场景中的一个重要属性,也是视觉处理通道的一个决定性特征。然而,关于灵长类动物视觉皮层的外纹状区如何对这种基本信息进行编码,仍然存在许多尚未解决的问题。在这里,我们使用猕猴 V2 和 V4 视觉区的固有信号光学成像,定量研究了 SF 图与(1)视觉拓扑和(2)颜色和方向图之间的关系。我们发现,在朝向区域中,低到高 SF 沿着朝向方向正交映射;在颜色区域中,据报道该区域包含颜色和亮度的正交轴,低频 SF 的表示频率高于高频 SF。这支持了与“颜色/朝向”组织相关的基于群体的 SF 波动。我们提出了一个跨皮质区域的广义超柱模型,该模型由两个正交参数和其他参数组成。