Route to chaos and chimera states in a network of memristive Hindmarsh-Rose neuron model with external excitation

TL;DR

This paper investigates complex dynamics, including chaos and chimera states, in a memristive Hindmarsh-Rose neuron network with various configurations, revealing novel double-well chimera phenomena.

Contribution

It introduces a memristive HR neuron network model exhibiting chaos and chimera states, including the first observation of double-well chimera states in such a system.

Findings

The model exhibits a reverse period doubling route to chaos.

Chimera states coexist with synchronized and desynchronized behaviors.

Double-well chimera states are observed in ring and ring-star networks.

Abstract

In this paper, we have introduced and investigated the collective behavior of a network of memristive Hindmarsh-Rose (HR) neurons. The proposed model was built considering the memristive autapse of the traditional 2D HR neuron. Using the one-parameter bifurcation diagram and its corresponding maximal Lyapunov exponent graph, we showed that the proposed model was able to exhibit a reverse period doubling route to chaos, phenomenon of interior and exterior crises. Three different configurations of the ring-star network of the memristive HR neuron model, including ring-star, ring, and star, have been considered. The study of those network configurations revealed incoherent, coherent, chimera, and cluster state behaviors. Coherent behavior is characterized by synchronization of the neurons of the network, while incoherent behaviors are characterized by the absence of synchronization. Chimera states refer to a different state where there is a coexistence of synchronized and asynchronized nodes of the network. One of the interesting results of the paper is the prevalence of double-well chimera states in both ring and ring-star network which has been first mentioned in the case of the memristive HR neuron model.