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Epilepsy disrupts hippocampal phase precision and impairs working memory.

Olivia N Arski1,2, Simeon M Wong2,3, Nebras M Warsi2,3,4

  • 1Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada.

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Summary

Working memory in children with epilepsy is linked to hippocampal neural oscillations. Transient epileptic activity disrupts this process, prolonging reaction times and impairing memory function.

Keywords:
epilepsyhigh-frequency oscillationshippocampusmemoryphase resetting

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Area of Science:

  • Neuroscience
  • Epileptology
  • Cognitive Science

Background:

  • Working memory deficits are common in childhood epilepsy.
  • Hippocampal neural oscillations are crucial for working memory processing.
  • Transient epileptic activity is associated with working memory disruptions.

Purpose of the Study:

  • To investigate the relationship between hippocampal neural oscillations, transient epileptiform events, and working memory in children with epilepsy.
  • To determine how the phase of hippocampal neural activity influences working memory performance.
  • To examine the impact of epileptic activity on working memory networks.

Main Methods:

  • Intracranial recordings from hippocampi and working memory networks in children with drug-resistant epilepsy.
  • Utilized a 1-back working memory task.
  • Analyzed hippocampal phase resetting (Rayleigh Z) and interregional connectivity (phase difference derivative) during trials with and without transient epileptic activity.

Main Results:

  • In the absence of epileptic activity, hippocampal phase resetting in delta and theta bands was observed, correlating with faster reaction times and enhanced interregional connectivity.
  • Transient epileptic activity attenuated phase resetting, altered interregional connectivity, and prolonged reaction times.
  • The precision of hippocampal phase predicted optimal working memory performance.

Conclusions:

  • Hippocampal phase plays a critical role in working memory processing in children with epilepsy.
  • Enhanced interregional connectivity coincides with hippocampal phase resetting during working memory tasks.
  • Transient epileptic activity significantly impairs working memory function by disrupting neural oscillations and connectivity.