Fig. 8
Auditory cortical units provide mostly independent information. a Quantification of neuronal pair types according to their composition (based on the unit classification as ST, BT, or NT). b Schematic representation of the joint response of two neurons, a and b, used to quantify Ijoint. c Statistical comparisons of Ijoint (blue) vs. Irate (gray) in each of the natural calls tested. In all cases, Ijoint was significantly higher than Irate (FDR-corrected Wilcoxon rank-sum tests, pcorr < 5.3 × 10−4). d Information carried by a joint response of a pair (Ijoint) plotted vs. the sum of information in the rate code (Irate) of each unit comprising such pair (each dot represents a pair, color coded according to the units that compose it; see also panel a), for each natural sequence tested. The red dashed line represents the regime in which two neuronal responses convey independent information (i.e. Ijoint = Irate(a) + Irate(b), with a slope of 1). Points below the line represent redundant interactions, whereas points above the line represent synergistic interactions between units in a pair. Regression slopes for observed data are indicated in each panel. (***pcorr < 0.01)
