Figure II, shows the bifurcation diagram of system (1) in terms of the parameter Iapp. In the experiments, a prescribed Iapp(t) that spans from 20 to 80 µA/cm2 was used. Note that for Iapp below Ibif ≈ 39.9632, there is one attractor, which is an equilibrium point of the system, while for Iapp ∈ (Ibif , 80), also there is a unique attractor, which is a limit cycle (only the maximal value of the variable v on the limit cycle is shown).
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