Figure 8.

A feedforward model examining mechanisms of SF dynamics in cortex. A, B, Responses of simple cells are modeled with a push–pull circuit. Excitatory input (A) to a cortical cell comes from spatially offset, although still overlapping, ON- and OFF-center LGN cells. The offset is exaggerated in this illustration for clarity. Inhibition (B) is provided by LGN cells with identical spatial position but opposite phase, after being routed through a cortical interneuron. The inhibition is parameterized with a time delay (τ) between excitation and inhibition, and a weight (W), which gives the relative level of inhibition compared with excitation.