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Neuronal Synapse as a Memristor: Modeling Pair- and Triplet-Based STDP Rule

机译:神经元突触作为忆阻器:建模基于对和三重态的STDP规则

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摘要

We propose a new memristive model for the neuronal synapse based on the spike-timing-dependent plasticity (STDP) protocol, considering both long-term and short-term plasticity in the synapse. Higher-order behavior is modeled by a memristor with adaptive thresholds, which realizes the well-established suppression principle of Froemke. We assume a mechanism of variable thresholds adapting to synaptic potentiation (LTP) and depression (LTD), which reproduces the refractory time in the weight modification. The corresponding dynamical process is governed by a set of ordinary differential equations. Interestingly, the Froemke's model and our memristive model, based on two completely different mechanisms, are found to be quantitatively equivalent for the ‘pre-post-pre’ case and ‘post-pre-post’ case. A relation of the adaptive thresholds to short-term plasticity is addressed.
机译:考虑到突触的长期和短期可塑性,我们提出了一种新的忆阻模型,用于神经元突触的基于尖峰时序依赖性可塑性(STDP)协议。高阶行为通过具有自适应阈值的忆阻器进行建模,从而实现了公认的Froemke抑制原理。我们假设可变阈值机制适应突触增强(LTP)和抑郁症(LTD),从而在体重改变中再现了不应时间。相应的动力学过程由一组常微分方程控制。有趣的是,发现Froemke模型和我们的忆阻模型基于两种完全不同的机制,在数量上等价于“事前-事前”案例和“事后-事后”案例。解决了自适应阈值与短期可塑性的关系。

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