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Noise-enhanced excitability in bistable activator-inhibitor media

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We show that external fluctuations induce excitable behavior in a bistable spatially extended system with activator-inhibitor dynamics of the FitzHugh-Nagumo type. This can be understood as a mechanism for sustained signal propagation in bistable media. The phase diagram of the stochastic system is analytically obtained and numerically verified. For small-noise intensities, front propagation becomes unstable, and excitable pulses arise as the only possible spatiotemporal behavior of the system. For large-noise intensities, on the other hand, the system enters an effective regime of oscillatory behavior, where it exhibits spontaneous nucleation of pulses and synchronized firing.

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GARCÍA OJALVO, Jordi, SAGUÉS I MESTRE, Francesc, SANCHO, José m., SCHIMANSKY-GEIER, Lutz. Noise-enhanced excitability in bistable activator-inhibitor media. _Physical Review E_. 2002. Vol. 65, núm. 1, pàgs. 011105-1-011105-6. [consulta: 9 de abril de 2026]. ISSN: 1539-3755. [Disponible a: https://hdl.handle.net/2445/18736]

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