Fig. 15.

Scatter plots of response strengths (not normalized) in the surrounds versus the centers for L-cone (A), M-cone (B), S-cone (C), and luminance responses (D) in units of spikes/(sec ·C), where C is the cone contrast of the stimulus. Data are shown for all neurons recorded in parvocellular layers; the symbols are as in Figure 13. Antagonistic center/surround responses fall in the second and fourth quadrants; nonantagonistic responses fall in the first and third quadrants (seeinsets). With few exceptions, all luminance responses (D) had antagonistic centers and surrounds. Most L-cone responses (A) and all M-cone responses (B) had nonantagonistic centers and surrounds (exceptions are indicated with arrows in A, as in Figs. 10, 13).