Bistability in pulse propagation in networks of excitatory and inhibitory populations

The effects of inhibition on the form and velocity of propagating pulses in networks of excitable cells were theoretically explored. Using a simplified version of the integrate-and-fire neuronal model, the velocity and stability of propagating continuous traveling pulses were calculated. Two types of propagating pulses were observed that differ by their velocities and by the delays between the firing times of inhibitory and excitatory cells.