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. 2014 Apr 23;4:4755. doi: 10.1038/srep04755

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. The images in this article are included in the article's Creative Commons license, unless indicated otherwise in the image credit; if the image is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the image. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

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(a) A simple illustration of neuron, synapse and neural spike. The customized spike (bottom right plot) is inspired by the biological firing curve (bottom left plot). (b) An illustration of spike waveforms at different presynaptic firing frequency. (c) An emulated of SRDP learning rule on iron oxide memristor. (d) The reported biological SRDP curve²⁶.