Figure 9.

Schematic diagram of a motor-sensory visual loop containing a bank of NPLLs of different intrinsic frequencies. V_x, V_e, V_i, velocities of an external object, the eye, and the retinal image, respectively; IF, intermediate filter that is centered around the working frequency of its corresponding NPLL; δ, α, γ, the frequency range containing the intrinsic frequency of an NPLL. The major transfer functions dominating the loop are described in the three insets: R_out is the output firing rate of an NPLL.