The distribution of interspike intervals, between network spikes, is shown for , , and (circles), 3.0 (squares) and 3.7 (triangles).

<p>While the network ISI distributions at low and high values of are quite well fitted by an exponential (shown as a solid black line), the network ISI at the critical threshold cannot be described by a single exponential (it strongly deviates from the exponential at intervals larger than 0.03 ms).