Figure 2. Noise-induced sustained limit cycle oscillations.

(A, B) Deterministic oscillations: effect of external temperature (T_ex) on oscillation frequency (A) and bifurcation point (B) are shown; (C–F) Noise-induced oscillations: no oscillations are observed for low noise amplitude, σ = 0.02 (C), while for large noise amplitude (σ = 0.25) oscillations are induced (D, E) and a limit cycle is created (F). Other parameters are as in Figure 1, except for T_ex in A and B and T_ex = 0.9 + η_w(τ) in (C–F).