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The direct relationship between inhibitory currents and local field potentials.

Andrew J Trevelyan1

  • 1Institute of Neuroscience and Institute for Ageing and Health, The Medical School, University of Newcastle, Newcastle NE2 4HH, United Kingdom. andytrev@gmail.com

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 4, 2009
PubMed
Summary

High-frequency oscillations (HFOs) during seizures may stem from synchronized inhibitory currents in pyramidal cells. These currents act as a restraint, with their visibility in field recordings linked to suppressed local activity.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Epilepsy Research

Background:

  • Extracellular field oscillations reflect brain states, but their origins, especially high-frequency oscillations (HFOs), remain unclear.
  • HFOs are clinically relevant, often preceding seizures and linked to inhibitory currents that restrain pyramidal cell firing.

Purpose of the Study:

  • To investigate the causal relationship between inhibitory synaptic currents and extracellular high-frequency oscillations (HFOs).
  • To determine if synchronized inhibitory currents in local pyramidal cell populations contribute to HFOs observed in field recordings.

Main Methods:

  • Analysis of inhibitory currents from single pyramidal cells and their correlation with extracellular field signals.
  • Comparison of inhibitory current similarity to extracellular signals under varying local pyramidal cell activity levels.

Main Results:

  • Single pyramidal cell inhibitory currents show significant similarity to extracellular signals during HFOs.
  • This similarity is strongest when local pyramidal cell activity is suppressed, indicating synchronized inhibitory input.
  • Correlation decreases with increased local activity, suggesting a shift in HFO generation mechanisms.

Conclusions:

  • A significant component of HFOs likely originates from synchronized inhibitory currents in local pyramidal cell networks.
  • These inhibitory currents act as a neural restraint, potentially delaying or opposing seizure spread.
  • HFOs may represent a final inhibitory effort before the failure of seizure containment.