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. 2010 Oct 8;4:129. doi: 10.3389/fncom.2010.00129

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Copyright © 2010 Bill, Schuch, Brüderle, Schemmel, Maass and Meier.

This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.

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Short-term plasticity-mechanism of the FACETS Stage 1 Hardware. A neuron is excited by an input neuron that spikes regularly at 20 Hz. Three hundred milliseconds after the last regular spike a single spike is appended. Additionally, the neuron is stimulated with Poisson spike trains from further input neurons. The figure shows the membrane potential of the post-synaptic neuron, averaged over 500 experiment runs. As the Poisson background cancels out, the EPSPs provoked by the observed synapse are revealed. Time and voltage are given in both hardware values and their biological interpretation. The three traces represent different modes of the involved synapse driver. Facilitation: The plastic synapse grows in strength with every AP processed. After 300 ms without activity the active partition has partly decayed. Depression: High activity weakens the synapse. Static: The synapse keeps its weight fixed.