Author(s)

G.E.La Cara & M. Ursino

Abstract

Comparison of different models of orientation selectivity in primary visual cortex G.E. La Cara & M. Ursino Department of Electronics, Computer Science, and Systems University of Bologna, Italy. Abstract Aim of this work is to compare different models for orientation selectivity in simple cells of the primary visual cortex, in order to gain deeper insight into the role and disposition of cortical connections. Two different models of simple cell response in an hypercolumn are compared. Both receive the same input pattern from the lateral geniculate nucleus, assuming that the geometry of the receptive field can be described through a Gabor function. Moreover, in both models cortical cells receive excitatory synapses from other neurons in the hypercolumn with near orientation preference. The two models differ as to the arrangement of inhibitory connections: in the first, inhibition is in phase opposition with excitation, but with a similar orientation tuning; in the second, inhibition is in phase

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