Neuronal activity and the mean synaptic weight in the network for 10 spk/s-external input.
Rastergrams and the average firing rates of all excitatory (light blue) and all inhibitory (dark red) neurons at (A) t = 0 to 0.5 s, (B) 3 to 3.5 s, and (C) 5 to 5.5 s. The lower panel of (C) is the enlargement of the selected area 5–5.2 s of the upper panel. Two black arrows represent the peaks of the firing rates of excitatory and inhibitory neurons. The average firing rates are estimated by Eq (11). (D) Time course of the mean synaptic weight of the plastic synapses. (E) Power spectra of the firing rates of excitatory (upper) and inhibitory (lower) neurons. The colors indicate the normalized power intensity.