ABSTRACT: We study the influence of internal fluctuations on the dynamics of thermochemical systems
which exhibit three distinct types of excitability. Simulations of the stochastic dynamics
follow the master equation approach which describes appropriately the discrete changes of
temperature due to a chemical reaction as well as continuous ones related to the exchange
of energy with a thermostat. The relative deviations from the mean values of the
interspike intervals are calculated as a measure of the coherence of the spike series.
These variables exhibit minima as functions of scaled reaction heat for all the cases
studied, proving the appearance of coherence resonance phenomena. Although reaction heat
is not a usual parameter applied to control the level of fluctuations, the existence of
coherence resonance can be explained as usual by the partition of the interspike interval
into the escape and excursion times.
Physics of Condensed Matter 05/2012; 84(1):137-145. · 1.53 Impact Factor