It is shown that the optimal path in a two-dimensional vector field is
deduced by the use of chemical wave in the Belousov-Zhabotinsky react
ion (BZ reaction). We also reproduced our experimental result in a num
erical simulation based on a two-variable reaction-diffusion equation.
The present result provides a simple model for the future application
of excitable media to parallel computing, i.e., an excitable medium s
erves as a self-organized parallel processor.