Fig. 7

Excitable regime—dynamics. Three cases for which formula (31) gives a correct prediction of the number of gamma spikes. Plot colors as in Fig. 4. ${\Theta }_0$ and $2\pi -{\Theta }_0$, i.e. the theta phases where the first and last Hopf bifurcation approximately take place, are shown in cyan. $\omega =4$, $\epsilon =0.1$ and $g_{IE}=6$. Left panel: $I_E=-0.1$, $\lambda =1$. Right panel: $I_E=-0.5$, $\lambda =1$