title: A digital implementation of neuron-astrocyte interaction for neuromorphic applications.
abstract: Recent neurophysiologic findings have shown that astrocytes play important roles in information processing and modulation of neuronal activity. Motivated by these findings, in the present research, a digital neuromorphic circuit to study neuron-astrocyte interaction is proposed. In this digital circuit, the firing dynamics of the neuron is described by Izhikevich model and the calcium dynamics of a single astrocyte is explained by a functional model introduced by Postnov and colleagues. For digital implementation of the neuron-astrocyte signaling, Single Constant Multiply (SCM) technique and several linear approximations are used for efficient low-cost hardware implementation on digital platforms. Using the proposed neuron-astrocyte circuit and based on the results of MATLAB simulations, hardware synthesis and FPGA implementation, it is demonstrated that the proposed digital astrocyte is able to change the firing patterns of the neuron through bidirectional communication. Utilizing the proposed digital circuit, it will be illustrated that information processing in synaptic clefts is strongly regulated by astrocyte. Moreover, our results suggest that the digital circuit of neuron-astrocyte crosstalk produces diverse neural responses and therefore enhances the information processing capabilities of the neuromorphic circuits. This is suitable for applications in reconfigurable neuromorphic devices which implement biologically brain circuits.
authors: Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran.
authors: Soheila
authors: S
authors: Nazari
authors: Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran.
authors: Karim
authors: K
authors: Faez
authors: Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran. Electronic address: ma.amiri@ece.ut.ac.ir.
authors: Mahmood
authors: M
authors: Amiri
authors: Department of Electronic, Razi University, Kermanshah, Iran.
authors: Ehsan
authors: E
authors: Karami
mesh_terms: D001253:Astrocytes / Q000502:physiology*; D006801:Humans; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology*; D013569:Synapses / Q000502:physiology
keywords: FPGA; Linear approximation; Neuromorphic; Neuron–astrocyte interactions