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Synaptic Symmetry Increases Coherence in a Pair of Excitable Electronic Neurons

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  • Bruno N S Medeiros
  • Mauro Copelli

Abstract

We study how the synaptic connections in a pair of excitable electronic neurons affect the coherence of their spike trains when the neurons are submitted to noise from independent sources. The coupling is provided by electronic circuits which mimic the dynamics of chemical AMPA synapses. In particular, we show that increasing the strength of an unidirectional synapse leads to a decrease of coherence in the post-synaptic neuron. More interestingly, we show that the decrease of coherence can be reverted if we add a synapse of sufficient strength in the reverse direction. Synaptic symmetry plays an important role in this process and, under the right choice of parameters, increases the network coherence beyond the value achieved at the resonance due to noise alone in uncoupled neurons. We also show that synapses with a longer time scale sharpen the dependency of the coherence on the synaptic symmetry. The results were reproduced by numerical simulations of a pair of synaptically coupled FitzHugh-Nagumo models.

Suggested Citation

  • Bruno N S Medeiros & Mauro Copelli, 2013. "Synaptic Symmetry Increases Coherence in a Pair of Excitable Electronic Neurons," PLOS ONE, Public Library of Science, vol. 8(12), pages 1-9, December.
    • Handle: RePEc:plo:pone00:0082051
    DOI: 10.1371/journal.pone.0082051
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    References listed on IDEAS

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    1. J. Donges & H. Schultz & N. Marwan & Y. Zou & J. Kurths, 2011. "Investigating the topology of interacting networks," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 84(4), pages 635-651, December.
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