Fig. 13.

Scatter plots of normalized cone weights, following Derrington et al. (1984), plotted for all neurons recorded in parvocellular layers. Shown are M-cone weights plotted versus L-cone weights, in which magnitudes of S-cone weights are determined by the distance from diagonal lines. Points near the diagonal lines are from cells that received negligible S-cone input. Points for which no S-cone measurements were performed are plotted outside the diagonal lines. Symbols signify the eight classes of cells. Antagonistic L-cone versus M-cone responses are in the second (II) and fourth (IV) quadrants. Nonantagonistic (mixed) responses are in the first (I) and third (III) quadrants. Each class clusters distinctly in the plot ofCenter weights (A), but less so in plots of Surround (B) andTotal (C) weights. The two cells that had clear mixed surrounds (Fig. 10A,B) are indicated with arrows (B).