Figure 3.

Models for the Role of Excitatory Receptive Field Organization in SAC Directional Responses

(A) Population average EPSCs evoked in DA SAC in response to rings of different radii. The traces are shifted in time to simulate proximal-to-distal CF motion (left) and distal-to-proximal CP motion (right). Bottom: linear summation of the shifted responses ± SEM (see Figure S2).

(B) As in (A), but for SAC recorded following RVS.

(C) Top: projection of an On-SAC filled with fluorescent dye (white) and its reconstruction (blue). Scale bar: 100 μm. Bottom: schematics of excitatory receptive field, in DA conditions (top, yellow area) and following RVS (bottom, gray area).

(D) Example somatic voltage of a simulated SAC response to CF and CP motion under the two excitatory receptive fields shown in (C). DA traces (red, blue) are plotted on top of RVS traces (orange, cyan). Insets depict the superimposed normalized average responses to CF and CP motion recorded from On-SAC.

(E) As in (D), but for SAC distal processes (d = 135 μm from soma).