Fig. 4.
Cycle-by-cycle activation of individual units in relation to population activity is stochastic. Spike rasters for 18 simultaneously recorded neurons (B), ordered along the ordinate axis by degree of burstiness exhibited in synaptic block, and color-coded for instantaneous firing rate (shown against population burst activity, background line in gray), and probability of anticipating population burst activity for each recorded cell calculated over entire control epoch (A). C: burst initiation probability (log10 transformed) of 688 cells is strongly related (Kendall tau = 0.60; P < 0.0001) to overall spike rate in control epochs and more weakly (although significantly; tau = 0.24; P < 0.0001) correlated with interspike interval metric of burstiness in synaptic block (D).