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Induction and modulation of persistent activity in a layer V PFC microcircuit model.

Athanasia Papoutsi1, Kyriaki Sidiropoulou, Vassilis Cutsuridis

  • 1Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas Heraklion, Greece ; Department of Biology, University of Crete Heraklion, Crete, Greece.

Frontiers in Neural Circuits
|October 17, 2013
PubMed
Summary

Small prefrontal cortex (PFC) microcircuits can generate persistent neural activity crucial for working memory. This activity relies on specific ion currents and intrinsic neuronal properties, suggesting multiple bi-stable units in the PFC.

Keywords:
GABABNMDAcomputer modeldADPintrinsic mechanismsprefrontal cortex

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Area of Science:

  • Computational Neuroscience
  • Systems Neuroscience
  • Cognitive Neuroscience

Background:

  • Working memory relies on persistent neural activity, traditionally linked to large-scale prefrontal cortex (PFC) networks.
  • Emerging evidence suggests small neuronal clusters may also support working memory functions.
  • Biophysical mechanisms for persistent activity in small PFC microcircuits remain poorly understood.

Purpose of the Study:

  • To develop and analyze a biophysically detailed microcircuit model of layer V PFC neurons.
  • To investigate the mechanisms underlying persistent activity in small neuronal networks.
  • To explore how stimulus properties and intrinsic conductances influence persistent activity.

Main Methods:

  • Construction of a simplified yet biophysically constrained microcircuit model of layer V PFC neurons.
  • Validation of the model against diverse experimental data.
  • Simulation of network activity under varying stimulus conditions and ionic conductance modulations.

Main Results:

  • A small-sized PFC microcircuit model demonstrated persistent activity under realistic conditions.
  • Persistent activity emergence was critically dependent on the interplay of dADP, NMDA, and GABAB currents.
  • Stimulus duration influenced persistent activity probability, while firing frequency variability did not show consistent effects.
  • Modulation of specific ionic conductances (e.g., I h, I D, I sAHP) differentially controlled persistent activity in a location-dependent manner.

Conclusions:

  • Small PFC microcircuits can intrinsically generate persistent activity, supporting the hypothesis of multiple bi-stable units.
  • Intrinsic neuronal properties and specific ion currents are key determinants of persistent activity.
  • The model provides testable predictions for understanding PFC working memory mechanisms.