Cortical Double-Opponent Cells in Color Perception: Perceptual Scaling and Chromatic Visual Evoked Potentials.
Cortical Double-Opponent Cells in Color Perception: Perceptual Scaling and Chromatic Visual Evoked Potentials.
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颜色感知中的皮质双重分量细胞：感知缩放和色彩视觉诱发电位。
DOI：
10.1177/2041669517752715
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发表时间：
2018-01
期刊：
影响因子：
1.9
通讯作者：
Gordon J
中科院分区：
文献类型：
--
作者：
Nunez V;Shapley RM;Gordon J
在早期视觉皮层 V1 中，目前已知的颜色感知神经基质只有两种：单对立细胞和双对立细胞。我们的目的是探索这些神经元对颜色感知的相对贡献。我们测量了等亮度颜色棋盘图案（旨在优先刺激双对立神经元）和均匀颜色方块（旨在仅刺激单对立神经元）在几个视锥细胞对比度下的颜色饱和度的感知缩放。单个对手神经元的空间整合响应对于棋盘会产生与对于相同空间平均锥体对比度的均匀正方形相同的响应幅度。然而，颜色棋盘的感知饱和度高于相应方块的饱和度。因此，感知结果意味着双对抗细胞参与了图案的颜色感知。我们还测量了相同刺激产生的色视觉诱发电位（cVEP）；棋盘格的 cVEP 比相应正方形的 cVEP 大得多，这意味着双对手细胞也有助于 cVEP 反应。 cVEP 的总傅立叶功率随锥体对比度呈亚线性增长。然而，6Hz 傅立叶分量的功率随着类似对比度的饱和度感知而线性增长。这也可能表明颜色的皮质编码取决于反应动态。
In the early visual cortex V1, there are currently only two known neural substrates for color perception: single-opponent and double-opponent cells. Our aim was to explore the relative contributions of these neurons to color perception. We measured the perceptual scaling of color saturation for equiluminant color checkerboard patterns (designed to stimulate double-opponent neurons preferentially) and uniformly colored squares (designed to stimulate only single-opponent neurons) at several cone contrasts. The spatially integrative responses of single-opponent neurons would produce the same response magnitude for checkerboards as for uniform squares of the same space-averaged cone contrast. However, perceived saturation of color checkerboards was higher than for the corresponding squares. The perceptual results therefore imply that double-opponent cells are involved in color perception of patterns. We also measured the chromatic visual evoked potential (cVEP) produced by the same stimuli; checkerboard cVEPs were much larger than those for corresponding squares, implying that double-opponent cells also contribute to the cVEP response. The total Fourier power of the cVEP grew sublinearly with cone contrast. However, the 6-Hz Fourier component’s power grew linearly with contrast-like saturation perception. This may also indicate that cortical coding of color depends on response dynamics.
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