THE EFFECT OF NOISE ON PATTERN DYNAMICS DURING DICTYOSTELIUM-DISCOIDEUM AGGREGATION

In this paper, we studied the effect of noise on pattern dynamics of t he spatial modulated two-variable diffusion-reaction model. We found t hat the dynamical behavior becomes more complex when noise is added. T he interaction between dynamic and stochastic force gives rise to the following features: 1) In spatiotemporal chaotic phase, the oscillatio n death emerges in some spatial sites when the noise level exceeds a c ritical value. We call it noise-induced Oscillation death. 2) In co-ex istence phase of chaotic and steady state, noise brings about oscillat ion behavior in the domain of oscillation death when its level exceeds a critical value. We call it noise-induced re-excitation of oscillati on. 3) There exist alternating periodic-chaotic states versus the nois e level in some spatial sites. 4) There exist superstable domains. In these domains the qualitative features do not change as the noise leve l increases.