Please use this identifier to cite or link to this item:
https://hdl.handle.net/2445/18736
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 Termodinàmica Sistemes dinàmics diferenciables Biofísica Física mèdica Biological and medical physics Statistical physics Thermodynamics Differentiable dynamical systems Biophysics 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: http://dx.doi.org/10.1103/PhysRevE.65.011105 |
It is part of: | Physical Review E, 2002, vol. 65, núm. 1, p. 011105-1-011105-6 |
URI: | https://hdl.handle.net/2445/18736 |
Related resource: | http://dx.doi.org/10.1103/PhysRevE.65.011105 |
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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