Figure 8.

Effect of center-surround receptive field structure. Responses of simulated midget cells with single-cone centers and mixed surrounds. Joint distributions for center cone types and positions corresponding to Figures 1F and 1G, as indicated by insets. Mixed surrounds were idealized as averages of L and M cone surrounds; thus, variability in the distributions is lower than expected with realistic surrounds. Compared to cone responses, correlations are strongly reduced and differences between distributions are larger (A: r = .25; B: r = .10).