Figure 7.
Estimation of neuronal clique sizes. Information rate for independent model (S1, gray dots) and for actual data (IN, black dots) are plotted in log–log space as a function of number of cells in ensemble. The point at which the S1 and the IN extrapolated lines would intersect gives an estimate of the ensemble size at which entropy would cease to increase. A–E, Representative plots for dissociated culture data, organotypic spike data, organotypic LFP data, acute slice LFP data, and human slice LFP data binned at 20 ms. F, Histogram showing average clique sizes for each data type, for both short (1.2 or 4 ms, gray) and long (20 ms, black) bin widths. Error bars give SDs. Results suggest that entropy will no longer increase with ensemble size in relatively small cliques.