Fig. 1.

Increasing A-type potassium channel density in the Connor–Stevens model switches neuron excitability from Type II to Type I back to Type II*. The three panels show simulation results of the Connor–Stevens model for different values of A-type potassium channel density: (Left) ${\overline{g}}_A$= 0 mS⋅cm⁻², (Middle) ${\overline{g}}_A$= 90 mS⋅cm⁻², and (Right) ${\overline{g}}_A$= 180 mS⋅cm⁻². The top of each panel shows membrane potential (V_m) traces for two different step input currents (I_app) (black and blue traces). The bottom of each panel shows neuron firing rate as a function of the input current (FI curve). Black points on the FI curves correspond to each of the example traces shown above.