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首页> 外文期刊>Nature >ABSENCE OF SPECTRALLY SPECIFIC LATERAL INPUTS TO MIDGET GANGLION CELLS IN PRIMATE RETINA
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ABSENCE OF SPECTRALLY SPECIFIC LATERAL INPUTS TO MIDGET GANGLION CELLS IN PRIMATE RETINA

机译：原始视网膜中特定的横向输入对小神经节细胞的缺乏

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VISUAL information is conveyed to the brain by retinal ganglion cells. Midget ganglion cells serve fine spatial vision(1,2) by summing excitation from a receptive field 'centre', receiving input from a single cone in the central retina, with lateral inhibition from a receptive field 'surround', receiving input from many surrounding cones, Midget ganglion cells are also thought to serve colour opponent vision(1-6) because the centre excitation is from a cone of one spectral type, while the surround inhibition is from cones of the other type(4,6). The two major cone types, middle(M)- and long(L)wavelength sensitive, are equally numerous and randomly distributed in the primate central retina(7-9), so a spectrally homogeneous surround requires that the cells mediating lateral interactions (horizontal or amacrine cells) receive selective input from only one cone type. Horizontal cells cannot do this because they receive input indiscriminately from M and L cones(10-12). Here we report that the amacrine cells connected to midget ganglion cells are similarly indiscriminate, The absence of spectral specificity in the inhibitory wiring raises doubt about the involvement of midget ganglion cells in colour vision and suggests that colour opponency may instead be conveyed by a different type of ganglion cell. [References: 28]
机译：视觉信息通过视网膜神经节细胞传递到大脑。小型神经节细胞通过汇总来自感受野“中心”的刺激，从中央视网膜的单个视锥细胞接收输入，具有来自感受野“周围环境”的侧向抑制，接收来自许多周围环境的输入来提供良好的空间视觉（1,2）视锥细胞，侏儒神经节细胞也被认为是服务于颜色对手的视觉（1-6），因为中心激发来自一种光谱类型的视锥细胞，而周围抑制来自另一种光谱类型的视锥细胞（4,6）。两种主要的视锥细胞类型，中度（M）-和长度（L）波长敏感，在灵长类中央视网膜（7-9）中数量相同且随机分布，因此，光谱上均一的环绕声要求细胞介导横向相互作用（水平或无长突细胞）仅从一种圆锥体接收选择性输入。水平单元无法做到这一点，因为它们不加选择地从M和L锥体接收输入（10-12）。在这里我们报告说，连接到侏儒神经节细胞的无长突细胞同样是不加区别的。抑制性谱中光谱特异性的缺乏引发了人们对侏儒神经节细胞参与色觉的怀疑，并暗示颜色相反性可能由另一种类型表达神经节细胞。 [参考：28]

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