Study On Dynamics Of Memristive Synapse Coupling Neural Networks Under Electromagnetic Radiation

Large-scale ion exchange and signal transmission in the neural system will inevitably produce complex electromagnetic radiation,and the effect of this electromagnetic radiation on dynamic behavior of the neural system cannot be ignored.In this paper,we improved the electrical synapse model based on the memristor model with flux variables,and investigated the effect of electromagnetic radiation in the neural system on its dynamic behaviors.Firstly,to improve the effectiveness of memristor model in complex network,the drift model of memristor was further optimized,and a new sinusoidal window function had been developed.The simulation results show that the memristor model with sinusoidal window function has good reliability.The new model is applied to the Hopfield neural network as synapse coupling term,and electromagnetic radiation effect is introduced as control parameter.The results show that the network exhibits rich dynamic behaviors such as steady state,periodic state,chaotic state under different electromagnetic radiation parameters.The works of this part have been published in 'Indian J Phys.'.Secondly,Hindmarsh-Rose neural system with memristive synapse coupling was constructed,and the collective behavior and regulation mechanism of neural system under electromagnetic radiation are studied.The simulation shows that the complex electromagnetic radiation in theneural system may induce abnormal firing patterns in neurons and abnormal synchronous discharge in the neural system,which provides a new idea for further study of nervous system diseases such as epilepsy.In addition,when the coupled system is in the synchronization state,one can see that the varying of the memristance will simultaneously change with the firing behavior of neurons.It means that the plasticity of biological synapses could be effectively mimicked by using the memristive synapse and thus the effective memory function of the memristive synapse to the external stimulus signal may be realized.This part of work has been also published in 'Nonlinear Dyn.'.Finally,we investigate the effect of electromagnetic radiation on the spatio-temporal dynamic behavior of multilayer memristive neural networks.It is found that,by adjusting the coupled strength of electrical synapses and the parameters of memristive synapses,the coexistence behavior of coherent and incoherent states,i.e.,the chimera states,could appear in each layer.Meanwhile,The chimera states are also found in inter-layer memristive synapse network.In addition,by discussing the interlayer synchronization behavior of this multilayer memristive neural networks,the spatio-temporal consistency of the chimera states in each layer neural network is observed.The work was also published in 'Nonlinear Dyn.'.The results of this paper show that by constructing neural networkswith memristive synapse coupling,it is found that electromagnetic radiation in the system plays an important role in regulating its dynamic behavior,which may find new important ideas for studying the mechanism of diseases related to the nervous system and provide useful clues to reveal the memory behavior of the nervous system in the human brain.