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. 2015 Mar 2;9:51. doi: 10.3389/fnins.2015.00051

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Copyright © 2015 Saïghi, Mayr, Serrano-Gotarredona, Schmidt, Lecerf, Tomas, Grollier, Boyn, Vincent, Querlioz, La Barbera, Alibart, Vuillaume, Bichler, Gamrat and Linares-Barranco.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Illustration of influence of action potential shapes on the resulting STDP memristor weight update function ξ(ΔT). Memristor upper and lower thresholds are normalized to amplitudes ±1.0. From (A1,A2) to (E1,E2) the same spike waveform travels forward and backward. In (F1,F2) the forward and backward waveforms are the same but have opposite polarity. In (G1,G2) to (H1,H2) the forward and backward waveforms are different. In (G1,G2), the positive pulse of the backward waveform exceeds amplitude +1.0, thus producing negative STDP update whenever there is a post-synaptic spike alone (G2); otherwise if pre- and post-synaptic spikes happen within a given time window, there will be positive STDP update.