Leaky Integrate-and-Fire $$C \frac{dV}{dt} = -g_{\rm leak}(V-V_{\rm rest})+I$$ Default parameters: $C=1$ nF, $g_{leak}=1/(10 M\Omega)$, $V_{\rm rest} = -70$ mV, $I=2.2$ nA, firing threshold $V_{thr}=-50$ mV.