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Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping
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Speech mapping using depth electrodes: The "electric Wada".

Fernando Alonso1, Jennifer Sweet1, Jonathan Miller1

  • 1The Neurological Institute, University Hospital Case Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, United States.

Clinical Neurology and Neurosurgery
|April 2, 2016
PubMed
Summary
This summary is machine-generated.

Stereo-EEG (SEEG) electrode stimulation can identify speech dominance in pediatric epilepsy patients, offering a safer alternative to the Wada test for surgical planning.

Keywords:
Brain mappingSEEGSpeech dominanceStereo-encephalographyWada test

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Area of Science:

  • Neurology
  • Neurosurgery
  • Epileptology

Background:

  • The Wada test is the standard for determining speech dominance but carries risks.
  • Patient cooperation is essential for the Wada test's success.

Purpose of the Study:

  • To evaluate the feasibility of using stereo-encephalography (SEEG) electrodes to verify speech laterality.
  • To explore an alternative to the Wada test for language lateralization in pediatric epilepsy patients.

Main Methods:

  • Four pediatric patients with drug-resistant frontal lobe epilepsy underwent SEEG implantation.
  • Electrodes were placed bilaterally in the inferior frontal gyri.
  • Electrical stimulation was applied during a reading task.

Main Results:

  • Speech arrest was consistently observed upon stimulation of one inferior frontal gyrus, confirming language laterality.
  • Contralateral stimulation yielded no speech arrest.
  • No adverse events occurred during implantation or stimulation.

Conclusions:

  • Brain mapping with SEEG electrodes is a viable method for lateralizing speech dominance.
  • This SEEG technique may obviate the need for the Wada test in selected epilepsy surgery cases.