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Area of Science:

  • Neuroscience
  • Epileptology
  • Computational Neuroscience

Background:

  • Drug-resistant focal epilepsy is a network disorder.
  • Neuronal oscillations (LFA, HFA, cross-frequency coupling) are implicated in seizure propagation.
  • Mechanisms of oscillatory network control over focal seizure spread are not fully understood.

Purpose of the Study:

  • To investigate multilayer directional network interactions in focal epilepsy.
  • To compare network dynamics in seizures with and without secondary generalization.
  • To elucidate the role of within- and cross-frequency oscillations in seizure propagation.

Main Methods:

  • Electrocorticography (ECoG) recordings from focal epilepsy patients.
  • Analysis of multilayer directional network interactions.
  • Estimation of within-frequency and cross-frequency directional connectivity using adaptive directed transfer function and cross-frequency directionality.

Main Results:

  • Seizure onset zone (SOZ) consistently showed stronger information outflow in the within-frequency network.
  • Secondary generalization correlated with reduced LFA information flow from surrounding regions to the SOZ.
  • Cross-frequency analysis revealed altered HFA to LFA information flow between SOZ and surrounding regions during generalization.

Conclusions:

  • Secondary generalization of focal seizures is modulated by within- and cross-frequency push-pull dynamics.
  • These dynamics may indicate impaired excitation-inhibition balance in the epileptic network.
  • Findings offer insights into the network mechanisms governing seizure spread in focal epilepsy.