The influence of depolarization block on seizure-like activity in networks of excitatory and inhibitory neurons

Christopher M. Kim, Duane Q. Nykamp

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The inhibitory restraint necessary to suppress aberrant activity can fail when inhibitory neurons cease to generate action potentials as they enter depolarization block. We investigate possible bifurcation structures that arise at the onset of seizure-like activity resulting from depolarization block in inhibitory neurons. Networks of conductance-based excitatory and inhibitory neurons are simulated to characterize different types of transitions to the seizure state, and a mean field model is developed to verify the generality of the observed phenomena of excitatory-inhibitory dynamics. Specifically, the inhibitory population’s activation function in the Wilson-Cowan model is modified to be non-monotonic to reflect that inhibitory neurons enter depolarization block given strong input. We find that a physiological state and a seizure state can coexist, where the seizure state is characterized by high excitatory and low inhibitory firing rate. Bifurcation analysis of the mean field model reveals that a transition to the seizure state may occur via a saddle-node bifurcation or a homoclinic bifurcation. We explain the hysteresis observed in network simulations using these two bifurcation types. We also demonstrate that extracellular potassium concentration affects the depolarization block threshold; the consequent changes in bifurcation structure enable the network to produce the tonic to clonic phase transition observed in biological epileptic networks.

Original languageEnglish (US)
Pages (from-to)65-79
Number of pages15
JournalJournal of Computational Neuroscience
Volume43
Issue number1
DOIs
StatePublished - Aug 1 2017

Keywords

  • Depolarization block
  • Excitatory-inhibitory network
  • Seizures
  • Wilson-Cowan model

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