Synaptic Metaplasticity Realized in Oxide Memristive Devices

Abstract

Metaplasticity, a higher order of synaptic plasticity, as well as a key issue in neuroscience, is realized with artificial synapses based on a WO3 thin film, and the activity-dependent metaplastic responses of the artificial synapses, such as spike-timing-dependent plasticity, are systematically investigated. This work has significant implications in neuromorphic computation.

Pavlovian conditioning demonstrated with neuromorphic memristive devices

“…The time-dependent long-term potentiation (LTP) in biological synapses consists of two periods with different characteristics, namely a spontaneous fast decay and a slow one that finally becomes stable 9, 49, 50 , which is the basis for forgetting and memory 10, 49, 50 . The synapse-like spontaneous decay enables the present artificial synapse to remember its past dynamic history, which is the key point to biorealistically mimic the Pavlovian conditioning.…”

Coexistence of analog and digital resistive switching in BiFeO3-based memristive devices

“…Though the current decay is unfavorable for non-volatile memories, it is advantageous for the synaptic applications of mimicking the synaptic plasticity in the neuromorphic computing. Recently, we successfully realized the metaplasticity in an artificial synapse based on the current decay phenomenon [32]. The exponential current decay can also be used to mimic the memory fading process, namely forgetting process [8].…”

Nanogenerator-induced synaptic plasticity and metaplasticity of bio-realistic artificial synapses

“…17,21 Additionally, these devices consume lower amounts of power and have good compatibility with CMOS technology. 17,26 Recently, metaplasticity has been reported in a WO 3 system, which shows great potential as a bio-realistic artificial synapse, 27 but further investigation of the various types of metaplasticity and their mechanisms needs to be performed.…”