Abstract
The nonlinear model put forward in Mahmoodi (J Math Imaging Vis 54(2):138–161, 2016) for early visual systems is investigated in detail in this paper to explain some nonlinear behaviours of complex and some simple cells. Nonlinear cells are modelled as systems with linear–nonlinear structures where the linear sub-unit is constructed by the layers proposed in Mahmoodi (2016) and nonlinear sub-units are the results of an axon (modelled as a transmission line) carrying a series of spikes. In this paper, the nonlinear sub-systems of complex cells are investigated in more detail to show the mechanism by which nonlinear neurons work. Here the nonlinear systems modelling nonlinear sub-units of complex cells are represented by their first- and second-order responses. Our analytical as well as numerical results show good agreements with biological recordings reported in the literature.
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Mahmoodi, S. Nonlinearity in Simple and Complex Cells in Early Biological Visual Systems. J Math Imaging Vis 58, 179–188 (2017). https://doi.org/10.1007/s10851-016-0698-9
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DOI: https://doi.org/10.1007/s10851-016-0698-9