|
Title:
|
Noise-enhanced excitability in bistable activator-inhibitor media
|
|
Author:
|
García Ojalvo, Jordi; Sagués i Mestre, Francesc; Sancho, José M.; Schimansky-Geier, Lutz, 1950-
|
|
Other authors:
|
Universitat de Barcelona |
|
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. |
|
Subject(s):
|
-Física estadística
-Termodinàmica
-Sistemes dinàmics diferenciables
-Biofísica
-Física mèdica
-Biological and medical physics
-Statistical physics
-Thermodynamics
-Differentiable dynamical systems
-Biophysics
-Medical physics |
|
Rights:
|
(c) The American Physical Society, 2002
|
|
Document type:
|
Article
Article - Published version |
|
Published by:
|
The American Physical Society
|
|
Share:
|
|
