Fig. 3.

Correlations in firing among LGN cells used in the simulations. In terms of composite correlation functions, these take the form C^ORI+ = r⁺M, C^ORI− = r⁻M, C^OD = dG₃, and C^SUM = 0 (see Fig. 1b,c). Here we illustrate these correlations in terms of the more intuitive, experimentally measurable functions C^S_ES_C, C^S_EO_C, C^O_ES_C, and C^O_EO_C (see Fig. 2a). a, LGN firing correlations corresponding to C^ORI+ and C^ORI− alone: d = 0. Model results for this case are shown in Figure 6. Correlation functions are shown for C^ORI+ dominant: r⁺ = 1, r⁻ ≤ r⁺. For C^ORI−dominant, r⁺ ≤ r⁻, the within-eye correlations would be identical to those shown here, whereas between-eye correlations would be of opposite signs to those shown here. b, LGN correlations attributable to C^OD with or without C^ORI+: r⁻ = 0. Functions of this form are used in Figures 5 and 7 and elsewhere. As in Figure 1b–e, the horizontal axes are in units of grid intervals (∼100 μm; Miller, 1994), and the vertical axes are in arbitrary units.