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Deviations from Critical Dynamics in Interictal Epileptiform Activity.

Oshrit Arviv1, Mordekhay Medvedovsky2,3, Liron Sheintuch4,5

  • 1Leslie and Susan Gonda (Goldschmied) Multidisciplinary Brain Research Center, Bar-Ilan University, 5290002 Ramat Gan, Israel, Oshrit.Arviv@biu.ac.il.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 2, 2016
PubMed
Summary
This summary is machine-generated.

Epilepsy patients show altered brain dynamics, deviating from healthy critical brain activity. Neuronal avalanche metrics reveal these changes, offering a new way to understand epilepsy between seizures.

Keywords:
MEGcriticalityepileptiformexcitation-inhibition balanceinterictal

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Healthy brain function relies on a precise balance between excitation and inhibition.
  • Epilepsy is characterized by hyperexcitable neural networks and altered excitation-inhibition balance (EIB).
  • Noninvasive assessment of EIB in neurological disorders remains challenging.

Purpose of the Study:

  • To investigate the sensitivity of neuronal avalanche metrics to altered EIB in human epilepsy.
  • To quantitatively assess deviations from critical brain dynamics in epilepsy patients during interictal activity.
  • To explore the relationship between critical dynamics, EIB, and epileptiform discharges.

Main Methods:

  • Utilized magnetoencephalography (MEG) to record brain activity in epilepsy patients and healthy controls.
  • Applied the framework of critical brain dynamics to analyze neuronal activity.
  • Quantitatively assessed neuronal avalanche metrics, including size distribution and spatial patterns.

Main Results:

  • Epilepsy patients exhibited deviations from critical brain dynamics compared to controls.
  • Increased neural gain and larger neuronal avalanches were observed in epilepsy patients, especially during interictal epileptiform activity.
  • Deviations from scale-free behavior were linked to epileptiform discharges, indicating rapid EIB changes.

Conclusions:

  • Neuronal avalanche metrics provide a sensitive, noninvasive tool for assessing changes in EIB.
  • Critical brain dynamics framework offers a novel quantitative perspective on epilepsy.
  • Findings highlight the link between EIB fluctuations and deviations from healthy brain dynamics in epilepsy.