Synaptic plasticity is a basic characteristic of synapses and plays an important role in the computation, learning and memory of human brain. Metaplasticity is a higher-order form of synaptic plasticity, which regulates the ability of synapses to generate synaptic plasticity and has a great regulating effect on later learning, memory and coping behaviors. At present, there are rarely reports on the emulation of synaptic metaplasticity in synaptic transistor. In this article, flexible dual-gate indium-zinc-oxide neuromorphic devices on freestanding solid-state proton conducting chitosan electrolyte membrane are designed for metaplasticity emulation. The key synaptic plasticity functions including excitatory postsynaptic current, synaptic paired-pulse response and synaptic pulse train response can be effectively regulated by the priming pulse stimuli. Besides, configurable synaptic depression and synaptic potentiation effect can be realized in such device. These results can expand the potential applications of the multi-terminal electrolyte-gated oxide transistors for flexible dynamic neuromorphic platforms.

突触可塑性是突触的基本特征，在人类大脑的计算，学习和记忆中起着重要作用。代谢可塑性是突触可塑性的一种高级形式，它调节突触产生突触可塑性的能力，并对以后的学习，记忆和应对行为具有很大的调节作用。目前，很少有关于突触晶体管中的突触可塑性模拟的报道。在本文中，设计了独立的固态质子传导壳聚糖电解质膜上的柔性双栅极铟锌氧化物神经形态器件，用于模拟可塑性。关键的突触可塑性功能包括兴奋性突触后电流，通过启动脉冲刺激可以有效地调节突触对脉冲响应和突触脉冲序列响应。此外，在这种装置中可以实现可配置的突触抑制和突触增强作用。这些结果可以扩展多端子电解质门控氧化物晶体管在柔性动态神经形态平台中的潜在应用。