Fig. 5

Oscillatory regime—dynamics. Two cases in which formula (31) gives a correct prediction of the number of gamma spikes and a fair estimate of spike times. Upper panel: instantaneous firing frequency of gamma cell obtained from simulation (full red line) and from Eq. (25) (black dotted line). Lower panel: the simulation of EG cell membrane potential is shown in red while black dotted lines represent firing times predicted by our analysis; the blue curve shows theta modulation ($1+cos\Theta$). Left: $I_E=0.5$, $\epsilon =0.1$, $\lambda =0.8$, $g_{IE}=6$, $\omega =4$. Right: $I_E=0.1$, $\epsilon =0.1$, $\lambda =0.5$, $g_{IE}=6$, $\omega =4$