THE RECEPTIVE-FIELD SPATIAL STRUCTURE OF CAT RETINAL Y CELLS
THE RECEPTIVE-FIELD SPATIAL STRUCTURE OF CAT RETINAL Y CELLS
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DOI：
10.1113/jphysiol.1987.sp016443
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发表时间：
1987-03-01
影响因子：
5.5
通讯作者：
FREEMAN, AW
中科院分区：
文献类型：
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作者：
ENROTHCUGELL, C;FREEMAN, AW
1. 猫视网膜y型神经节细胞受到光条和光栅图案的刺激。刺激是静止的，每个点的亮度在2hz下随时间呈正弦变化。记录单个细胞的脉冲率。2. 当刺激是窄条光时，随着对比度的降低，脉冲率接近于时间的正弦函数。因此，每个细胞的线性行为的特征是，当对比度接近零时，取响应参数的极限。3. 细胞间的包围强度与中心强度之比差异很大，但两者的平均强度大致相等。环绕相位与中心相位之差平均为168度。随着对比的增加，反应变得纠正了。整流器输出很好地描述了一个功率定律的刺激幅度，其中功率通常为1.4或1.5。5. 响应相位随着对比度的增加而增加，在高响应幅值时，响应相位的增长小于与对比度成比例的增长。这些影响是由于Shapley和Victor（1978）描述的对比度增益控制而假设的。6. 采用亮度随距离呈正弦变化的接枝来确定Y细胞的空间分辨率。二次谐波振幅随空间频率的增加而迅速减小：对于偏心度为10°的单元，最佳拟合高斯机制的半径约为0.25°。7. 这个空间分辨率接近Linsenmeier， Feishman， Jakiela和Enroth-Cugell（1982）确定的X细胞的线性分辨率。8. 描述了一个包含线性和非线性元素的感受野模型。该模型由一系列亚单元路径组成，每个路径都有一个中心-环绕组织，然后是一个整流器；池对子单元输出进行加权和求和，然后信号通过对比度增益控制。9. 该模型定性地解释了Y细胞线性响应的整体中心-环绕组织，倍频响应对空间频率的依赖，以及脉冲率作为各种条形和光栅刺激的时间函数。
1. Y-type ganglion cells in the cat''s retina were stimulated with bars of light and grating patterns at photopic luminances. Stimuli were stationary, and luminance at each point was varied sinusoidally in time at 2 Hz. Impulse rates were recorded from single cells. 2. When the stimulus was a narrow bar of light, the impulse rate approached a sinusoidal function of time as contrast was reduced. The linear behavior of each cell was therefore characterized by taking the limit of response parameters as contrast approached zero. 3. The ratio of surround strength to centre strength varied widely between cells but the two strengths were approximately equal on average. The difference between surround phase and centre phase averaged 168 deg. 4. As contrast increased, responses became rectified. Rectifier output was well described by a power law of stimulus amplitude, where the power was usually 1.4 or 1.5. 5. Response phase advanced with increasing contrast, and at high response amplitudes grew less than proportionally with contrast. These effects were assumed due to the contrast gain control described by Shapley and Victor (1978). 6. Graftings in which luminance varied sinusoidally with distance were used to determine Y cell spatial resolution. The second-harmonic amplitude of the response diminished rapidly with increasing spatial frequency: the radius of the best-fitting Gaussian mechanism was about 0.25 deg for a cell at 10 deg eccentricity. 7. This spatial resolution is close to the linear resolution of X cells as determined by Linsenmeier, Feishman, Jakiela and Enroth-Cugell (1982). 8. A receptive field model incorporating both linear and non-linear elements is described. The model consists of an array of subunit pathways, each of which has a centre-surround organization followed by a rectifier; a pool weights and sums subunit outputs, and signals are then passed through a contrast gain control. 9. The model accounts qualitatively for the over-all centre-surround organization of Y cell linear responses, the dependence of frequency-doubled responses on spatial frequency, and impulse rate as a function of time for a variety of bar and grating stimuli.