Victor J D, Shapley R M
J Gen Physiol. 1979 Aug;74(2):275-98. doi: 10.1085/jgp.74.2.275.
We investigated receptive field properties of cat retinal ganglion cells with visual stimuli which were sinusoidal spatial gratings amplitude modulated in time by a sum of sinusoids. Neural responses were analyzed into the Fourier components at the input frequencies and the components at sum and difference frequencies. The first-order frequency response of X cells had a marked spatial phase and spatial frequency dependence which could be explained in terms of linear interactions between center and surround mechanisms in the receptive field. The second-order frequency response of X cells was much smaller than the first-order frequency response at all spatial frequencies. The spatial phase and spatial frequency dependence of the first-order frequency response in Y cells in some ways resembled that of X cells. However, the Y first-order response declined to zero at a much lower spatial frequency than in X cells. Furthermore, the second-order frequency response was larger in Y cells; the second-order frequency components became the dominant part of the response for patterns of high spatial frequency. This implies that the receptive field center and surround mechanisms are physiologically quite different in Y cells from those in X cells, and that the Y cells also receive excitatory drive from an additional nonlinear receptive field mechanism.
我们使用由正弦波之和进行时间幅度调制的正弦空间光栅视觉刺激，研究了猫视网膜神经节细胞的感受野特性。神经反应被分析为输入频率处的傅里叶分量以及和频与差频处的分量。X细胞的一阶频率响应具有显著的空间相位和空间频率依赖性，这可以根据感受野中中心和周边机制之间的线性相互作用来解释。在所有空间频率下，X细胞的二阶频率响应都远小于一阶频率响应。Y细胞一阶频率响应的空间相位和空间频率依赖性在某些方面与X细胞相似。然而，Y细胞的一阶响应在比X细胞低得多的空间频率下就降至零。此外，Y细胞的二阶频率响应更大；对于高空间频率的模式，二阶频率分量成为响应的主要部分。这意味着Y细胞的感受野中心和周边机制在生理上与X细胞有很大不同，并且Y细胞还从额外的非线性感受野机制接收兴奋性驱动。
