Comparison between a spike pattern of model SB (SB panels) and a rate-modulated pattern of Model RB (RB panels), both having a bimodal distribution of latencies. (SB1) Model SB. The plot displays afferents that fire with a mean latency ms with a spread ms around this latency, and afferents that fire with a mean latency ms and same spread ms. (SB2) The average cross-correlogram over the respective groups (circles) corresponds to Equation (16). (RB1) Model RB. The plot displays two afferents of each group. In each group all the afferents have the same pattern rate function: Gaussians centered respectively on ms and ms with width ms and amplitudes . (RB2) The cross-correlogram between two afferents in distinct groups exhibits a peak at ms. Plots SB3–8 and RB3–8 are similar to those in Fig. 3. (SB3,SB6 and RB3,RB6) and : the earliest cluster is selected. (SB4,SB7 and RB4,RB7) and : the latest cluster is selected. (SB5,SB8 and RB5,RB8) and : the latest cluster is selected.