Figure 2.

Correlated variability. A, Average r_sc for pairs of neurons as a function of distance. Neuronal pairs were grouped in 0.5 mm distance groups starting at 0.25 mm. The red line represents data from Monkey B and the black line represents data from Monkey D. B, Average r_sc for pairs of neurons as a function of r_signal or tuning similarity. C, Dependence of r_sc on both distance and tuning similarity for the pooled data from both monkeys. Bins containing <10 pairs are removed (indicated with white). The scale of the surface plot is indicated by the bar at the right of the panel. The data in this and all subsequent surface plots were smoothed with a two-dimensional Gaussian (SD of 1 bin) for display purposes only.