Integrated Mechanisms of Anticipation and Rate-of-Change Computations in Cortical Circuits
Figure 9
Physiological Implementations of an Anticipatory Network Reproduce Advanced Sensory Responses to Moving Versus Flashed Visual Stimuli
(A) Stimulus configurations as in [21]. Incoming current Iin depended on the position of the moving or flashed bar in the receptive field (top row). For a bar moving with speed v, Iin was a Gaussian of s.d. L/v, (L = receptive field radius, ∼3° in primary visual cortex).
(B) Superposition of the Iin's for the two stimuli in (A) (gray lines) and corresponding outputs from the model presented in Figure 7 (Ipost's, black traces) show advanced response to moving with respect to flashed stimuli (Δt = 29 ms). Inset: Apparent spatial shift between moving and flashed stimulus from neural responses (vΔt) for increasing speed v.
(C) Same as in (B) but for the model presented in Figure 8. Inset: zoom on the inputs (gray) and responses (black) around the time of the flash onset, showing the advanced response to moving with respect to flashed stimuli.
Vertical scale bar in (B) for (B) and (C) represents 0.5 μA/cm2.