Thalamocortical connectivity is enhanced following functional hemispherotomy for intractable lateralized epilepsy

George M. Ibrahim*, Benjamin R. Morgan, Mary Lou Smith, Elizabeth Kerr, Elizabeth Donner, Cristina Y. Go, Sam Doesburg, Margot Taylor, Elysa Widjaja, James T. Rutka, O. Carter Snead

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Although developmental outcomes may improve following functional hemispherotomy for lateralized, catastrophic childhood epilepsy, the neuronal processes mediating these improvements are unknown. We report the case of a 14-year-old child with neurocognitive impairment who underwent functional hemispherotomy with longitudinal resting-state fMRI. Compared with preoperative fMRI, we report significantly more robust thalamo-default mode network connectivity on postoperative neuroimaging. Furthermore, we show decreased connectivity to nodes within the disconnected hemisphere, providing direct evidence that functional interactions are dependent upon structural connectivity. Since the vascular supply to these nodes remains intact, although they are disconnected from the remainder of the brain, these findings also confirm that blood-oxygen level dependent oscillations are driven primarily by neuronal activity. The current study highlights the importance of thalamocortical interactions in the understanding of neural oscillations and cognitive function, and their impairment in childhood epilepsy.

Original languageEnglish (US)
Pages (from-to)281-285
Number of pages5
JournalEpilepsy and Behavior
Volume51
DOIs
StatePublished - Oct 1 2015

Keywords

  • Epilepsy
  • Functional connectivity
  • Hemispherectomy
  • Oscillations
  • Peri-insular hemispherotomy
  • Resting-state fMRI
  • Thalamocortical oscillations

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology
  • Behavioral Neuroscience

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