Excitable media chemical wave generation

The above discussion provides an explanation for how a chemical wave can be generated and propagated in an excitable medium, given a sufficiently large initial perturbation. Where that initial perturbation comes from is a question that still needs to be addressed. 

The recurrence times for fluctuations of varying sizes are calculated using Equation (17), and their magnitudes determine the likelihood of observing a chemical wave which has been induced by an internal fluctuation in the time the experiment is carried out. The results of the calculations for wave generation in an excitable medium by means of Br excitation are shown in Table IV. 

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