Emulation of biphasic plasticity in retinal electrical synapses for light-adaptive pattern pre-processing

Lindong Wu; Zongwei Wang; Bowen Wang; Qingyu Chen; Lin Bao; Zhizhen Yu; Yunfan Yang; Yaotian Ling; Yabo Qin; Kechao Tang; Yimao Cai; Ru Huang

doi:10.1039/D0NR08012H

Emulation of biphasic plasticity in retinal electrical synapses for light-adaptive pattern pre-processing†

Lindong Wu,^a Zongwei Wang,

*^ac Bowen Wang,^a Qingyu Chen,^a Lin Bao,

^a Zhizhen Yu,^a Yunfan Yang,^a Yaotian Ling,^a Yabo Qin,^a Kechao Tang,^a Yimao Cai*^ab and Ru Huang*^ab

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* Corresponding authors

^a Institute of Microelectronics, Peking University, Beijing 100871, P. R. China
E-mail: wangzongwei@pku.edu.cn, caiyimao@pku.edu.cn, ruhuang@pku.edu.cn

^b Frontiers Science Center for Nano-Optoelectronics, Peking University, Beijing 100871, P. R. China

^c Advanced Institute of Information Technology (AIIT), Peking University, Hangzhou, Zhejiang 311215, P. R. China

Abstract

Electrical synapses provide rapid, bidirectional communication in nervous systems, accomplishing tasks distinct from and complementary to chemical synapses. Here, we demonstrate an artificial electrical synapse based on second-order conductance transition (SOCT) in an Ag-based memristor for the first time. High-resolution transmission electron microscopy indicates that SOCT is mediated by the virtual silver electrode. Besides the conventional chemical synaptic behaviors, the biphasic plasticity of electrical synapses is well emulated by integrating the device with a photosensitive element to form an optical pre-processing unit (OPU), which contributes to the retinal neural circuitry and is adaptive to ambient illumination. By synergizing the OPU and spiking neural network (SNN), adaptive pattern recognition tasks are accomplished under different light and noise settings. This work not only contributes to the further completion of synaptic behaviour for hardware-level neuromorphic computing, but also potentially enables image pre-processing with light adaptation and noise suppression for adaptive visual recognition.

Nanoscale

Emulation of biphasic plasticity in retinal electrical synapses for light-adaptive pattern pre-processing†

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Emulation of biphasic plasticity in retinal electrical synapses for light-adaptive pattern pre-processing

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