Coherence resonance in neuronal populations: mean-field versus network model

TL;DR

This paper investigates coherence resonance in neuronal populations modeled by FitzHugh-Nagumo neurons, comparing mean-field analytical approaches with network simulations to understand how coupling and noise influence oscillation regularity.

Contribution

It develops and compares mean-field models for locally and globally coupled FHN neuron networks, providing analytical insights into coherence resonance phenomena.

Findings

Good agreement between mean-field and network results in globally coupled case

Mean-field models effectively capture coherence resonance and anticoherence resonance

Coupling strength and noise intensity significantly affect resonance behavior

Abstract

The counter-intuitive phenomenon of coherence resonance describes a non-monotonic behavior of the regularity of noise-induced oscillations in the excitable regime, leading to an optimal response in terms of regularity of the excited oscillations for an intermediate noise intensity. We study this phenomenon in populations of FitzHugh-Nagumo (FHN) neurons with different coupling architectures. For networks of FHN systems in excitable regime, coherence resonance has been previously analyzed numerically. Here we focus on an analytical approach studying the mean-field limits of the locally and globally coupled populations. The mean-field limit refers to the averaged behavior of a complex network as the number of elements goes to infinity. We derive a mean-field limit approximating the locally coupled FHN network with low noise intensities. Further, we apply mean-field approach to the globally coupled FHN network. We compare the results of the mean-field and network frameworks for coherence resonance and find a good agreement in the globally coupled case, where the correspondence between the two approaches is sufficiently good to capture the emergence of anticoherence resonance. Finally, we study the effects of the coupling strength and noise intensity on coherence resonance for both the network and the mean-field model.