Coherence resonance in chains of noisy excitable neurons coupled by interactions with delay

Influence of the interaction time-delay on the noise induced system size resonance in a system of all-to-all electrically coupled FitzHugh-Nagumo excitable neurons is studied. It is observed that small time-lags decrease and that large time-lags increase the coherence of spiking. Bifurcations of the system´s stationary state are used to explain the observed non-monotonic dependence of coherence on the time-lag.