Noise controlled pattern formation in subexcitable media

The numerical simulation on a reaction-diffusion system indicates that diff erent patterns can be obtained by tuning the strength of parameter noise in subexcitable media. With the increase of noise intensity, the waves sustai ned by noise are not broken up as usual, they evolve orderly, and the perio d of the waves decreases, the survival time of waves varies. The time inter val of inputting noise also influences the process of pattern formation and the survival time of waves.