Figure 5
From: Activity-Dependent Synaptic Plasticity of a Chalcogenide Electronic Synapse for Neuromorphic Systems
Bidirectional learning rule as a function of the postsynaptic potential.
(a) In our memristor, the voltage-response function for the induction of LTD and LTP exhibits two parts: at a postsynaptic potential below Vθ, the synapse is depressed, whereas synaptic potentiation can be observed beyond Vθ. In this case, Vθ is approximately 0.52 V. (b) Dependence of synaptic modification on the pulse number. After approximately 40 coincident stimulations, the synaptic efficacy achieves stability, so 50 pairs of pre- and postsynaptic stimulations are used in each plot measurement of (a).
