Fig. 17.

Peak times of L- and M-cone responses in centers (A–C) and of luminance responses in centers and surrounds (D–F). A, Scatter plot of M-cone peak times versus L-cone peak times for red–green opponent parvocellular neurons. L-cone responses were faster for L-cone center cells (circles), and M-cone responses were faster for M-cone center cells (squares); thesymbols are as in Figures 13-16.B, For magnocellular neurons the L-cone responses were faster. C, Histogram of differences between M-cone and L-cone peaks. D, E, Scatter plots of surround versus center peaks for red–green opponent parvocellular (D) and magnocellular (E) neurons. Three M-cone center cells with noisy surround responses had nominal peaks >60 msec. These cells were excluded. F, Histogram of differences between surround and center peaks. With two exceptions, all surrounds were slower.