Models of neuronal activity in the visual cortex

Michael Shelley
Courant Institute
New York University

Abstract: Using reverse correlation techniques on responses to randomly oriented stimulii, Ringach, Hawkin, and Shapley investigated the dynamics of orientation selection and tuning in the monkey visual cortex (V1). I will discuss models of V1 that consist of layered networks of "integrate-and-fire" point neurons receiving weakly tuned input. The neuronal populations are of two types, inhibitory and excitatory, with coupling length-scales that are consistent with anatomical observation. Our simulations and a "mean-field" analysis suggest that sharpening of orientation tuning is accomplished by an effective, intermediate-range inhibition emerging from the interaction of the two populations.