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. 2014 Feb 10;111(8):3170–3175. doi: 10.1073/pnas.1310442111

Fig. 3.

Fig. 3.

Luminance/response functions of ON and OFF visual responses. (A and B) Luminance/response functions of OFF responses in LGN (circles) and V1 (crosses) are roughly linear when measured on light (A) and gray (B) backgrounds. Visual responses were fitted with a Naka-Rushton function and the half saturation (L50) and maximum response (Rmax) constants were estimated. (C) Luminance/response functions for ON responses in LGN (circles) and V1 (crosses) saturated with small luminance increments on dark backgrounds. (D) On gray backgrounds, the ON luminance/response functions became more linear; however, ON functions were still more compressive than OFF functions. (E) L50 for OFF responses was similar on gray and light backgrounds. (F) L50 for ON responses was much higher on gray than dark backgrounds. (G) Rmax for OFF responses was similar in gray and light backgrounds. (H) In LGN (circles), Rmax for ON responses was similar in dark and gray backgrounds. In V1 (crosses), Rmax for ON responses was lower in gray than dark backgrounds. (I and J) On gray backgrounds, Rmax (I) and L50 (J) in V1 were larger for OFF than ON responses. Notice that I and J compared OFF and ON responses generated by the same V1 recording site.