Model for local image velocity detection of early visual processing

Abstract

A motion model which includes inquisition on the velocity properties for the early stages of motion processing in the visual cortex is presented. The model presents analytically the correlation between cell parameters and the velocity tuning curve. The "building-block" for this model is the "rebound response", which is the excitatory response evoked when a sufficient inhibitory stimulus is turned off. The analysis described deals separately with the two "cutoff points" of the velocity tuning curves. The model predicts linear relation between the low "cutoff point" with the integration time, and a reversed correlation to the receptive field size. The high "cutoff point" is reversed, correlated with the cell threshold. The predictions are confirmed using computerized simulation and physiological findings.