CHROMATIC MECHANISMS IN LATERAL GENICULATE-NUCLEUS OF MACAQUE
CHROMATIC MECHANISMS IN LATERAL GENICULATE-NUCLEUS OF MACAQUE
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DOI：
10.1113/jphysiol.1984.sp015499
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发表时间：
1984-01-01
影响因子：
5.5
通讯作者：
LENNIE, P
中科院分区：
文献类型：
--
作者：
DERRINGTON, AM;KRAUSKOPF, J;LENNIE, P
本文介绍了一种新的神经元颜色特性分析技术，并将其应用于外侧膝状体细胞（l.g.n.）猕猴的。该方法利用了这样一个事实，即对于任何线性组合来自视锥细胞的信号的细胞，都有一组有限的光，它对这些光同样敏感，并且其成员可以相互交换而不会引起反应。刺激在三维空间中表示，该三维空间由以下轴限定：沿该轴沿着只有亮度变化而没有色度变化;沿“恒定B”轴沿着色度变化而不改变对蓝色敏感的（B）视锥的激发;沿“恒定R & G”轴沿着色度变化而不改变对红色敏感的（R）或对绿色敏感的（G）视锥的激发。正交轴相交于一个白色点。由“恒定B”和“恒定R & G”轴的交点定义的等亮度平面包含仅在色度上变化的光。在极坐标中，恒定的B轴被指定为方位角0 - 180度，恒定的R & G轴被指定为方位角90 - 270度。亮度表示为高于或低于等亮度平面的高度（-90至+90度）。对于任何线性组合视锥信号的细胞，在这个空间中有一个平面，通过白色点，包含所有可以无声交换的光。该“零平面”的位置提供了细胞的“特征”，并且由其方位角（其与刺激空间的等亮度平面相交的方向）和其仰角（其与等亮度平面的倾斜角）指定。彩色电视接收机用来产生正弦光栅，其色度和亮度可沿沿着通过所述空间中的白色点的任何矢量进行调制。调制的空间和时间频率可以在大范围内变化。当受到低空间和低时间频率的刺激时，l.g.n.小细胞层中的两组细胞。由它们的零平面的位置来区分。较大组的零平面窄分布在92.6度的方位角附近，更广泛地分布在51.5度的仰角附近，这表明它们仅从R和G视锥接收相反但不相等平衡的输入。我们称之为R-G细胞（400字处删节）
This paper introduces a new technique for the analysis of the chromatic properties of neurones, and applies it to cells in the lateral geniculate nucleus (l.g.n.) of macaque. The method exploits the fact that for any cell that combines linearly the signals from cones there is a restricted set of lights to which it is equally sensitive, and whose members can be exchanged for one another without evoking a response. Stimuli are represented in a three‐dimensional space defined by an axis along which only luminance varies, without change in chromaticity, a 'constant B' axis along which chromaticity varies without changing the excitation of blue‐sensitive (B) cones, a 'constant R & G' axis along which chromaticity varies without change in the excitation of red‐sensitive (R) or green‐sensitive (G) cones. The orthogonal axes intersect at a white point. The isoluminant plane defined by the intersection of the 'constant B' and 'constant R & G' axes contains lights that vary only in chromaticity. In polar coordinates the constant B axis is assigned the azimuth 0‐180 deg, and the constant R & G axis the azimuth 90‐270 deg. Luminance is expressed as elevation above or below the isoluminant plane (‐90 to +90 deg). For any cell that combines cone signals linearly, there is one plane in this space, passing through the white point, that contains all lights that can be exchanged silently. The position of this 'null plane' provides the 'signature' of the cell, and is specified by its azimuth (the direction in which it intersects the isoluminant plane of the stimulus space) and its elevation (its angle of inclination to the isoluminant plane). A colour television receiver was used to produce sinusoidal gratings whose chromaticity and luminance could be modulated along any vector passing through the white point in the space described. The spatial and temporal frequencies of modulation could be varied over a large range. When stimulated by patterns of low spatial and low temporal frequency, two groups of cells in the parvocellular laminae of the l.g.n. were distinguished by the locations of their null planes. The null planes of the larger group were narrowly distributed about an azimuth of 92.6 deg and more broadly about an elevation of 51.5 deg, which suggests that they receive opposed, but not equally balanced, inputs from only R and G cones. These we call R‐G cells.(ABSTRACT TRUNCATED AT 400 WORDS)