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The lesioned brain: still a small-world?

Linda Douw1, Edwin van Dellen, Johannes C Baayen

  • 1Department of Neurology, VU University Medical Center Amsterdam, Netherlands.

Frontiers in Human Neuroscience
|December 2, 2010
PubMed
Summary
This summary is machine-generated.

The Wada test (intra-arterial amobarbital procedure) reveals that sedating one brain hemisphere makes the overall network more random. This altered brain network topology correlates with memory performance in epilepsy surgery patients.

Keywords:
Wada testbrain networkfunctional connectivitygraph theorysmall-world networks

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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Network Science

Background:

  • The intra-arterial amobarbital procedure (IAP), or Wada test, is crucial for assessing language and memory lateralization in epilepsy patients undergoing neurosurgery.
  • It involves unilateral hemisphere sedation to evaluate contralateral brain function.

Purpose of the Study:

  • To utilize the IAP as a reversible model for studying the impact of focal brain alterations on whole-brain network topology.
  • To investigate how changes in brain network characteristics after IAP relate to memory functioning.

Main Methods:

  • Electroencephalogram (EEG) data from 33 epilepsy surgery patients were analyzed before and after amobarbital injection.
  • Functional connectivity was assessed using synchronization likelihood across four frequency bands.
  • Weighted network analysis calculated metrics like clustering coefficient, path length, and small-world index.

Main Results:

  • Amobarbital injection significantly altered network topology, decreasing clustering and path length, indicating a shift towards a more random network.
  • Edge weight correlation decreased in theta and beta bands post-injection.
  • Higher theta band small-world index and upper alpha band path length correlated with better post-injection memory scores.

Conclusions:

  • Selective hemisphere sedation in epilepsy patients leads to a more random and less optimally organized whole-brain network topology.
  • Brain network topology is intrinsically linked to cognitive functions like memory, as demonstrated by the correlation between network characteristics and memory scores.