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. Author manuscript; available in PMC: 2010 Jan 25.
Published in final edited form as: J Vis. 2009 Feb 12;9(2):15.1–1518. doi: 10.1167/9.2.15

Figure 4.

Figure 4

Area summation of PC cells with chromatic spots (5 Hz, red-green modulation ∼27% RMS contrast for L and M cones). (A) Response amplitude (1F response) rises to a plateau. Center and surround responses reinforce one another, so the plateau diameter reflects total receptive field size, center plus surround. Data were fitted with a single cumulative Gaussian, since separate center and surround contributions were seldom apparent. (B) Gaussian radii of PC cells' receptive fields (center plus surround) and MC cells' chromatic fields (replotted with regression line from Figure 3) overlap.