A-E. Distribution of correlations between phasic responses of two central mitral sisters (50 mitral-pair—odor combinations, but 350 for D) in different connectivities namely A. Random connectivity, B. Directed connectivity, C. Directed with different leak reversal potentials: -58 and -70 mV (effectively different thresholds) for the sister pair, D. Default ‘super-inhibitory’ connectivity with two lateral odor-responsive glomeruli, E. Default ‘super-inhibitory’ connectivity with six lateral odor-responsive glomeruli. The delta-rate correlation is noted at top left of each histogram for each connectivity. For A-C, the receptor spike rate to central glomerulus was halved for odor compared to default i.e. D; while for E, it was quadrupled for air and doubled for odor, to get similar mean firing rate as D. Only the default model in D had substantial decorrelation: note the negative correlation bins, which have been shaded; and the delta-rate correlation values.