Mechanisms of switching: Nonlinear resonance.

A Bifurcation diagram of the focus with f as bifurcation parameter at A = 1. B Inset of A, with period-doubling bifurcations (orange dots) and emerging branches of period-doubled solutions shown. The period-doubling cascade gives rise to stable chaos (grey area), which becomes unstable at lower frequencies. C Example time series from B around the area where the chaotic attractor becomes unstable. Parameters: η = −10, , Δ = 2, τ = 20ms.