Fig. 16.

Simulations results of (10) with $ϵ=0.001$ to approximate the singular orbit. A: Using parameters $g_M=-0.5$, $I_{\mathit{ton}}=1$, $J=0.16$, $w\approx 0.74$ before the I-cell spikes. B: Using parameters $g_M=-0.3$, $I_{\mathit{ton}}=5$, $J=0.16$, $w\approx 0.7$ before the I-cell spikes. Top row: voltage traces of the I-cell (blue) and the E-cell (red). Bottom row: the trace of M-current gating variable w