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Title: Noise-enhanced excitability in bistable activator-inhibitor media
Author: García Ojalvo, Jordi
Sagués i Mestre, Francesc
Sancho, José M.
Schimansky-Geier, Lutz, 1950-
Keywords: Física estadística
Sistemes dinàmics diferenciables
Física mèdica
Biological and medical physics
Statistical physics
Differentiable dynamical systems
Medical physics
Issue Date: 2002
Publisher: The American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2002, vol. 65, núm. 1, p. 011105-1-011105-6
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)
Articles publicats en revistes (Física Quàntica i Astrofísica)

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