David J. Heeger, Eero P. Simoncelli

Abstract

A number of researchers have proposed models of early motion sensing based on direction selective spatiotemporal linear operators Others have formalized the problem of measuring optical ow in terms of the spatial and temporal derivatives of stimulus intensity Recently the spatiotemporal lter models and the gradient based methods have been placed into a common framework In this chapter we review that framework and we extend it to develop a new model for the computation and representation of velocity information in the visual system We use the model to simulate psychophysical data on perceived velocity of sine grating plaid patterns and to simulate physiological data on responses of simple cells in primary striate visual cortex