Distribution of inter-burst intervals and burst sizes. A–B Distribution of burst sizes. C–D Distribution of interburst intervals. Data are shown from 8 recordings from arbitrarily selected cultures (different colors), at around 7 div (A and C), and around 35 div (B and D). Bimodality in the IBI distribution results from temporal clustering of bursts. Data were binned using a Gaussian window in logarithmic space, bin size was 5% of a decade.