Neural mechanisms of contrast dependent receptive field size in V1

Based on a large scale spiking neuron model of the input layers 4Candof macaque, we identify neural mechanisms for the observed contrast dependent receptive field size of V1 cells. We observe a rich variety of m echanisms for the phenomenon and analyze them based on the relative gain of excitatory and inhibitory synaptic inputs. We observe an average growth in the spatial extent of excitation and inhibition for low contrast, as predicted fr om phenomenological models. However, contrary to phenomenological models, our simulation results suggest this is neither sufficient nor necessary to explain t he phenomenon.

Accepted 5 December 2005
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