Differentiation processing of linear and nonlinear information in retinal neural network

A simplified neural network in the catfish inner retina is discussed. The network is divided into two subcircuits: C-circuit and N-circuit. The difference between C-circuit and N-circuit is the existence of type-N amacrine cell in the N-circuit. The role of type-N cell in the network is investigated. The most prominent features of differentiation can be found in the responses of NA cells, but since the degree of differentiation changes according to time in the NA cell responses, the author introduced a modified differentiation. The modified differentiation of N cells shows band-pass characteristics in the frequency domain, while normal differentiation shows high-pass ones