Synaptic plasticity and learning behaviours in flexible artificial synapse based on polymer/viologen system

Abstract

Flexible memristive devices that emulate the physiological behaviours of synapses have been fabricated with redox active [EV(ClO4)2]/(TPA-PI) bilayer structures.

Flexible Artificial Synaptic Devices Based on Collagen from Fish Protein with Spike‐Timing‐Dependent Plasticity

“…Since the shape of the action potentials governs the STDP function, by changing the pulse scheme one can achieve a reliable STDP comparable with a biological neural system based on the Hebbian rule . There are several schemes to realize the STDP; a simple way to achieve this property is applying single pulse or gradually increased nonidentical pulses; however, some reports use a pair of pulses to trigger the device . To implement STDP, we imposed a pair of stimuli that consisted of a positive pulse (2 V, 10 ms) following a negative pulse (−3 V, 10 ms) on both of the pre‐ and postsynaptic parts of the biomemristor (Figure S6, Supporting Information).…”

Recent Advances in Resistive Switching Materials and Devices: From Memories to Memristors

“…Consequently, synaptic behaviors (Fig. 30), including the spike-rate-dependent and spike-timingdependent plasticity (SRDP and STDP) characteristics, the transition from short-term memory (STM) to long-term memory (LTM), as well as the Ebbinghaus forgetting process, are realized in [51][52][53][54] EV(ClO ) /BTPA-F bilayer structure, which may offer new 4 2 opportunities for the construction of molecular electronics that can greatly enhance the performance of modern computer systems.…”

Recent progress in memristors for stimulating synaptic plasticity

“…人脑的短时记忆 (short time memory, STM) 持续时间一般被认为从毫秒到数分钟不等, 它只能通 过刺激被短暂的维持, 而长时记忆 (long time memory, LTM) 持续时间为几小时、几天、几周有时甚 至可长达一生, 它不需要用随后的刺激来维持, 因为它已经在突触的结构上产生了一些变化 [32] . 与短 时记忆和长时记忆相对应的短时程可塑性和长时程可塑性 (STP/LTP) 被认为是哺乳动物大脑中最主 要的两种突触可塑性的形式, STP 对应于突触受刺激后的短暂增强神经连接, 大多数的 STP 是由短 期或一些突发性活动引起的, 例如 STP 可以由 Ca 2+ 在突触前神经元的瞬时积累造成, 这些 Ca 2+ 的 增加反过来又影响突触活动中神经递质的释放能力 [33] , STP 往往对感觉输入的短时程适应、短时程 行为改变、以及短时程记忆有重要作用, 并且被认为可以帮助大脑过滤掉一些不必要的信息 [34,35] ; 而 LTP 则是在短时记忆的基础上经过反复训练和有意义的连接形成的永久性记忆, 对应于突触权重持久 的改变 [36,37] , 一般持续时间达到几天以上, 通过充分的训练, 可以实现 STP 到 LTP 的转化.…”