  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.
