Títol:
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Noise-enhanced excitability in bistable activator-inhibitor media
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Autor/a:
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García Ojalvo, Jordi; Sagués i Mestre, Francesc; Sancho, José M.; Schimansky-Geier, Lutz, 1950-
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Altres autors:
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Universitat de Barcelona |
Abstract:
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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. |
Matèries:
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-Física estadística -Termodinàmica -Sistemes dinàmics diferenciables -Biofísica -Física mèdica -Biological and medical physics -Statistical physics -Thermodynamics -Differentiable dynamical systems -Biophysics -Medical physics |
Drets:
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(c) The American Physical Society, 2002
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Tipus de document:
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Article Article - Versió publicada |
Publicat per:
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The American Physical Society
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Compartir:
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