Figure 5.

Average activation and inactivation rates for the HHSAP model, where s is held constant. (A) ${\overline{\gamma }}_1\left(\mathbf{\text{s}}\right)$ (B) ${\overline{\gamma }}_2\left(\mathbf{\text{s}}\right)$ (C) ${\overline{\delta }}_1\left(\mathbf{\text{s}}\right)$ (D) ${\overline{\delta }}_2\left(\mathbf{\text{s}}\right).$ ${\overline{\delta }}_1$ and ${\overline{\gamma }}_2$ are almost constant, while ${\overline{\gamma }}_1$ and ${\overline{\delta }}_2$ have a sharp discontinuity near the threshold area Θ (Figure 3B). I₀ = 8 μA, T = 50 ms with V, m, n, h initial conditions set at steady state value.