## Abstract

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 resp>onses 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 resp onse of X cells was much smaller than the first-order frequency response at all spatial frequencies. The spatial phase and spatial frequency dep)endence 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 comp>onents became the dominant part of the response for patterns of high spatial frequency. This implies that the receptive field center md 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.

Original language | English |
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Pages (from-to) | 275-298 |

Number of pages | 24 |

Journal | Journal of General Physiology |

Volume | 74 |

Issue number | 2 |

DOIs | |

State | Published - 1 Aug 1979 |

Externally published | Yes |