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Noise-enhanced excitability in bistable activator-inhibitor media
García Ojalvo, Jordi; Sagués i Mestre, Francesc; Sancho, José M.; Schimansky-Geier, Lutz, 1950-
Universitat de Barcelona
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.
2011-07-26
Física estadística
Termodinàmica
Sistemes dinàmics diferenciables
Biofísica
Física mèdica
Biological and medical physics
Statistical physics
Thermodynamics
Differentiable dynamical systems
Biophysics
Medical physics
(c) The American Physical Society, 2002
Article
The American Physical Society
         

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