Laminar analysis of human neocortical interictal spike generation and propagation: Current source density and multiunit analysis in vivo

I. Ulbert, Gary Heit, Joseph Madsen, G. Karmos, Eric Halgren

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Multicontact microelectrodes were chronically implanted in epilepsy patients undergoing subdural grid implantation for seizure localization. Current source density and multiple unit activity of interictal spikes (IISs) were sampled every ∼150 μm in a line traversing all layers of a cortical column. Our data suggest that interictal epileptiform events in humans are initiated by large postsynaptic depolarizations, consistent with the hypothesis that human IISs correspond to animal paroxysmal depolarization shifts. Furthermore, the cortical layer where the initial depolarization occurs may differ according to whether the IIS is locally generated or propagated from a distant location, and among the propagated IISs, whether the IIS is in the direct path of propagation or on the periphery of that path.

Original languageEnglish
Pages (from-to)48-56
Number of pages9
JournalEpilepsia
Volume45
Issue numberSUPPL. 4
Publication statusPublished - 2004

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Microelectrodes
Epilepsy
Seizures

Keywords

  • Current source density
  • Epilepsy
  • Human neocortex
  • Interictal spikes
  • Multiple unit activity

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

Cite this

Laminar analysis of human neocortical interictal spike generation and propagation : Current source density and multiunit analysis in vivo. / Ulbert, I.; Heit, Gary; Madsen, Joseph; Karmos, G.; Halgren, Eric.

In: Epilepsia, Vol. 45, No. SUPPL. 4, 2004, p. 48-56.

Research output: Contribution to journalArticle

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