Effects of imperfection of ionic channels and exposure to electromagnetic fields on the generation and propagation of front waves in nervous fibre

This work deals with the effects of perturbations such as imperfection of ionic channels and exposure to electromagnetic field on the generation and propagation of wave fronts in a nervous fibre. The initial excitation inserted in the fibre is a pulse of amplitude a and width 1/k. The domain of initial values of a and k leading to front waves generation are delineated for each type of perturbation. Links of the results to biological facts are given. It is found that imperfections of ionic channels strongly modify the velocity of propagation and can even lead to propagation failure.