MODEL OF LOCAL VELOCITY IN THE PRIMARY VISUAL CORTICAL-CELLS

A motion model for the early stages of motion processing in the visual cortex that focuses on velocity properties is presented. The model pr esents analytically the correlation between the velocity tuning curve and various cell parameters. The building block for this model is the rebound response, which makes possible the detection of spatial and te mporal edges. The model suggests that adjacent subunits in the primary cortical cells display different strengths in their rebound responses , and thus a synergistic response is evoked in the preferred direction . The analysis deals separately with the two cutoff points of the velo city tuning curves. The model predicts a linear relation between the l ow cutoff point and the receptive-field size and an inverse correlatio n with the integration time. The high cutoff point is inversely correl ated with the cell threshold.