A discrete Huber-Braun neuron model: from nodal properties to network performance

Shaobo He; Karthikeyan Rajagopal; Anitha Karthikeyan; Ashokkumar Srinivasan

doi:10.1007/s11571-022-09806-1

A discrete Huber-Braun neuron model: from nodal properties to network performance

Cogn Neurodyn. 2023 Feb;17(1):301-310. doi: 10.1007/s11571-022-09806-1. Epub 2022 May 3.

Authors

Shaobo He¹, Karthikeyan Rajagopal², Anitha Karthikeyan³, Ashokkumar Srinivasan²

Affiliations

¹ School of Physics and Electronics, Central South University, Changsha, 410083 China.
² Center for Nonlinear Systems, Chennai Institute of Technology, Chennai, India.
³ Department of Electronics and Communication Engineering, Prathyusha Engineering College, Chennai, India.

Abstract

Many of the well-known neuron models are continuous time systems with complex mathematical definitions. Literatures have shown that a discrete mathematical model can effectively replicate the complete dynamical behaviour of a neuron with much reduced complexity. Hence, we propose a new discrete neuron model derived from the Huber-Braun neuron with two additional slow and subthreshold currents alongside the ion channel currents. We have also introduced temperature dependent ion channels to study its effects on the firing pattern of the neuron. With bifurcation and Lyapunov exponents we showed the chaotic and periodic regions of the discrete model. Further to study the complexity of the neuron model, we have used the sample entropy algorithm. Though the individual neuron analysis gives us an idea about the dynamical properties, it's the collective behaviour which decides the overall behavioural pattern of the neuron. Hence, we investigate the spatiotemporal behaviour of the discrete neuron model in single- and two-layer network. We have considered obstacle as an important factor which changes the excitability of the neurons in the network. Literatures have shown that spiral waves can play a positive role in breaking through quiescent areas of the brain as a pacemaker by creating a coherence resonance behaviour. Hence, we are interested in studying the induced spiral waves in the network. In this condition when an obstacle is introduced the wave propagation is disturbed and we could see multiple wave re-entry and spiral waves. In a two-layer network when the obstacle is considered only in one layer and stimulus applied to the layer having the obstacle, the wave re-entry is seen in both the layer though the other layer is not exposed to obstacle. But when both the layers are inserted with an obstacle and stimuli also applied to the layers, they behave like independent layers with no coupling effect. In a two-layer network, stimulus play an important role in spatiotemporal dynamics of the network.

Supplementary information: The online version contains supplementary material available at 10.1007/s11571-022-09806-1.

Keywords: Bifurcation; Chaos; Discrete neuron; Spiral waves.