Fig. 1.

Spike histograms of 3,000 ms of four simulations, for the excitatory (left-hand side) and the inhibitory (right-hand side) subpopulation. The stimulation protocol is as follows: Stimulation I _ext was switched on 3,000 ms after initialization for 1,000 ms. Each stimulation is monopolar (excitatory DC stimulation) and either uninterupted DC (a, b), or modulated by a rectangular envelope of 10 Hz (c, d), 100 Hz (e, f), or 1,000 Hz (g, h), respectively. Before and after the stimulation, the behavior of the unstimulated system is visible