Fig. 6.

Stochastically phase-locked firing (skipping) in a tonic VO₂ active memristor neuron. a–d Tonic spike trains excited by an input d.c. current of 82.5 µA amplitude and 35 ms duration. For clarity, only the initial sections of ~3 ms duration are displayed. White noise signals with 5 µA_pp, 15 µA_pp, 25 µA_pp, and 50 µA_pp peak-to-peak values, respectively, are added to the current input to study its impact on the firing pattern and the correlation between consecutive interspike intervals (ISIs). e–h Joint interspike interval (JISI) scatter plots (aka return maps) of the spike trains shown in (a–d). Also shown are the histograms of the ISI distributions. The numbers of spikes used to generate the JISI plots are 1149, 1113, 620, and 754, respectively