Figure 2:

Voltage responses of a large single cone (L-cone), a principal member of a double cone (P-cone), an accessory member of a double cone (A-cone) and a small single cone (S-cone) to a light annulus S1 (A), center-surround stimulus C1S1 (B), C2S2 (C) and C3S3 (D). Responses to S2 (400/2,000µm, 700nm, −2) are not shown. Cones’ RFs were determined by a stepwise moving light bar (E), a procedure similar to that for HCs in Figure 1A. The RFDs of these cones were about 50 µm (green dots), which are characteristic of salamander photoreceptors (Skrzypek & Werblin, 1983). A’-D’ illustrate dimensions of S1, C1S1, C2S2 and C3S3, respectively. ΔV_Cone(s): surround-elicited depolarizing response in cones (voltage between two blue dashed lines, solid vertical red lines, only illustrated for the L-cone (first column) to avoid busy labeling). F: Average (+/− SE) surround response strengths (surround/center ratios, defined as S/(C_t-C_S) with various stimulus patterns (x-axis), where S, C_t and C_S are the amplitudes of the surround, transient center and sustained rebound responses, respectively, insert in F) of the four types of cones elicited by S1, S2, C1S1, C2S2 and C3S3.