A multiplicity of color-responsive cortical mechanisms revealed by the dynamics of cVEPs
A multiplicity of color-responsive cortical mechanisms revealed by the dynamics of cVEPs
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cVEP 动力学揭示了多种颜色响应皮质机制
DOI：
10.1016/j.visres.2021.07.017
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发表时间：
2021
期刊：
影响因子：
1.8
通讯作者：
Shapley, Robert M.
中科院分区：
文献类型：
--
作者：
Nunez, Valerie;Gordon, James;Shapley, Robert M.
我们的研究结果将从心理物理学推导出的高阶颜色机制与V1中双重对手，颜色响应细胞的已知多样性联系起来。我们使用彩色视觉诱发电位（cVEP）来研究人类视皮层对等亮度颜色模式的反应。刺激沿着颜色空间中的三个方向进行沿着调制：基本方向、L-M和S，以及沿着颜色空间中从白色点到显示屏中红色LED的颜色的线（红色方向）。在锥衬坐标中，红色方向大致介于DKL空间中的L-M和S之间。虽然cVEP反应幅度，潜伏期和宽度-以及它们对锥对比度的依赖性-在L-M和红色方向上相似，但红色反应的瞬时性显著大于对L-M方向和S方向刺激的反应。反应动力学的这种差异支持了这样的概念：人类V1皮质内存在多个不同的神经元群体，即所谓的高阶颜色机制，用于颜色感知。
Our results connect higher-order color mechanisms deduced from psychophysics with the known diversity of populations of double-opponent, color-responsive cells in V1. We used the chromatic visual evoked potential, the cVEP, to study responses in human visual cortex to equiluminant color patterns. Stimuli were modulated along three directions in color space: the cardinal directions, L-M and S, and along the line in color space from the white point to the color of the Red LED in the display screen (the Red direction). The Red direction is roughly intermediate between L-M and S in DKL space in cone-contrast coordinates. While cVEP response amplitude, latency, and width--and their dependences on cone contrast-- were similar in the L-M and Red directions, the Transientness of the Red response was significantly greater than for responses to stimuli in the L-M direction and in the S direction. This difference in response dynamics supports the concept that there are multiple, distinct neuronal populations, so-called higher- order color mechanisms, for color perception within human V1 cortex.