Fig. 5

Short-term synaptic plasticity of the electronic synapse: Variations in the absolute current values (or synaptic weight) with respect to potentiating pulse number for different a pulse intervals, b pulse amplitudes. c Mean changes (ΔI) of current during cycles of 10 pulses at different pulse amplitudes. d PPF behaviors of Pt/HfSiOx/TaN memristor with postsynaptic EPSCs triggered by a pair of presynaptic spikes, with 0.1 ms interval times. e PPF index as a function of the inter-spike time interval between two pulses. The light blue curve represents the exponential fit. f Modulation of the EPSC change with different pulse voltage amplitudes from ‒ 0.6 V to ‒ 0.8 V and spike numbers ranging from 1 to 50, respectively. g EPSC gain in relation to the quantity of pulses. h EPSC responses at various pulse widths of 100 µs and 200 µs while increasing the number of spikes from 1 to 25 at a constant pulse amplitude of ‒ 0.7 V. i  EPSC gain as a function of various pulse counts