Creutzfeldt O, Lee B B, Valberg A
Exp Brain Res. 1986;63(1):21-34. doi: 10.1007/BF00235643.
We recorded from single neurons in the parvocellular layers of the lateral geniculate body of anesthetized monkeys. Spectral response curves of parvocellular neurons depended on the luminance ratio between the chromatic stimuli and achromatic background. From response/intensity curves, we determined the relative luminance between a coloured and an achromatic (white) light at which a given cell became non-responsive (critical luminance ratio, CLR). The spectral dependence of the CLRs of narrow (N) and wide band (W) cells with opponent receptor input showed characteristic differences. The activity of W-cells increased with luminance increase of a white light and of a coloured light in the specific spectral region of the cell (yellow-red for the long wave length sensitive WL-, and yellow-green-blue for the short wave length sensitive WS-cells), while N-cells were activated by their specific spectral light (blue for NS-cells, red for NL-cells) and by a luminance decrease of achromatic white. N-cells discriminate best between their characteristic colour and white at luminance ratios below their respective CLR, while W-cells distinguish best between a light of their characteristic colour and white at chromatic/achromatic luminance ratios above their respective CLR. Yellow sensitive W-cells with a narrow spectral sensitivity peaking around 570 nm and with only a small or no response to white light, could enable distinction between white and yellow of similar luminance. The findings are consistent with the opponency model of spectrally sensitive cells in the LGB. We discuss their implications for colour coding by parvocellular cells. N- and W-cells appear to behave complementary with respect to luminance information (N-cells may be compared to the cat's off-cells, W-cells to on-cells). S- and L-cells are complementary with respect to colour. The yellow sensitive WM-cells are critical for the discrimination of yellow and white, while cells with excitatory cone input from blue and red cones (W-SL-cells) may aid the perception of purple. The fact that, at different relative luminance ratios between a chromatic stimulus and a white background, the whole family of parvocellular cells is involved differently in coding for colour, may explain the different appearance of colours against a white background at different luminance ratios and the perception of induced colours.
我们在麻醉猴的外侧膝状体小细胞层中的单个神经元上进行记录。小细胞神经元的光谱响应曲线取决于色刺激与消色差背景之间的亮度比。根据响应/强度曲线，我们确定了给定细胞变得无反应时（临界亮度比，CLR）彩色光与消色差（白色）光之间的相对亮度。具有对立受体输入的窄带（N）和宽带（W）细胞的CLR的光谱依赖性显示出特征差异。W细胞的活动随着白光以及细胞特定光谱区域中彩色光的亮度增加而增加（长波敏感的WL细胞为黄红色，短波敏感的WS细胞为黄绿色 - 蓝色），而N细胞则由其特定光谱光（NS细胞为蓝色，NL细胞为红色）以及消色差白光的亮度降低所激活。N细胞在亮度比低于其各自的CLR时，能最好地区分其特征颜色与白色，而W细胞在色/消色差亮度比高于其各自的CLR时，能最好地区分其特征颜色的光与白色。光谱敏感性窄、在570nm左右达到峰值且对白光只有很小反应或无反应的黄色敏感W细胞，能够区分相似亮度的白色和黄色。这些发现与外侧膝状体中光谱敏感细胞的对立模型一致。我们讨论了它们对小细胞进行颜色编码的意义。N细胞和W细胞在亮度信息方面似乎表现为互补（N细胞可与猫的off细胞相比较，W细胞可与on细胞相比较）。S细胞和L细胞在颜色方面互补。黄色敏感的WM细胞对于区分黄色和白色至关重要，而来自蓝色和红色视锥细胞具有兴奋性输入的细胞（W - SL细胞）可能有助于紫色的感知。在色刺激与白色背景之间不同的相对亮度比下，整个小细胞家族在颜色编码中参与方式不同，这一事实可能解释了在不同亮度比下白色背景上颜色的不同外观以及诱导色的感知。
