Fig. 12.

The evolution of relative theta band power (a) and firing rate (b) during the increase of the ionic conductance $g_{\mathit{AHP}}$ for different $g_M$ when $g_K=10.0{\mathrm{mS}/\mathrm{cm}}^2$. It can be seen that for different $g_M$ the relative theta band power always first increases and then approaches its maximum at a critical value as $g_{\mathit{AHP}}$ is increased. Moreover, the firing rate first slightly decreases and then abruptly decreases to zero