Dynamical regimes of the deterministic model (ε =
0). Left: Bifurcation diagram of the model in the (b,
gK1)-parameter plane. Black solid and dashed
curves correspond (resp.) to supercritical and subcritical AH
bifurcations of the depolarized (left branch) and hyperpolarized (right
branch) equilibrium state. Open circle indicates the Bautin bifurcation
(BA). Green line corresponds to a saddle-node bifurcation of limit
cycles. Blue curve indicates a torus birth bifurcation of a stable
small-amplitude limit cycle. Red line indicates a period doubling
bifurcation of a stable large-amplitude spiking limit cycle. Points
labeled A-H correspond to the voltage traces on the right panel: b
= 0.2, gK1 = 15 nS (A); b = 0.2,
gK1 = 40 nS (B); b = 0.01,
gK1 = 28 nS (C); b = 0.01,
gK1 = 29.192 nS (D); b = 0.01,
gK1 = 29.213 nS (E); b = 0.01,
gK1 = 29.25 nS (F); b = 0.01,
gK1 = 35 nS (G); b = 0.01,
gK1 = 40 nS (H). Other parameters are
gL = 0.174 nS, gMET = 0,
gh = 2.2 nS, ε = 0.