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Related Experiment Video

Updated: Jun 2, 2026

Low-Cost Electroencephalographic Recording System Combined with a Millimeter-Sized Coil to Transcranially Stimulate the Mouse Brain In Vivo
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Low-Cost Electroencephalographic Recording System Combined with a Millimeter-Sized Coil to Transcranially Stimulate the Mouse Brain In Vivo

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Inter-individual variation in the efficient stimulation site for magnetic brainstem stimulation.

Yuichiro Shirota1, Ritsuko Hanajima, Masashi Hamada

  • 1Department of Neurology, Division of Neuroscience, Graduate School of Medicine, University of Tokyo, Bunkyo-Ku, Tokyo, Japan. yshirota-tky@umin.ac.jp

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|May 4, 2011
PubMed
Summary

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Magnetic brainstem stimulation (BST) efficiency varies by site. Ipsilateral BST often yields stronger motor evoked potentials (MEPs) and lower active motor thresholds (AMTs) compared to inion BST in healthy subjects.

Area of Science:

  • Neuroscience
  • Neurophysiology
  • Biomedical Engineering

Background:

  • Brainstem stimulation (BST) is a technique used to assess neural pathways.
  • Understanding inter-individual variability in BST efficiency is crucial for clinical applications.

Purpose of the Study:

  • To investigate how the stimulation site affects the efficiency of magnetic brainstem stimulation (BST).
  • To identify optimal stimulation parameters for BST in individual subjects.

Main Methods:

  • Thirty-one healthy subjects participated in the study.
  • Motor evoked potentials (MEPs) were recorded from a right hand muscle.
  • Three stimulation sites were tested: inion BST, ipsilateral BST, and contralateral BST.

Main Results:

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  • Contralateral BST rarely produced discernible MEPs.
  • Ipsilateral BST elicited larger MEPs in 67.7% of subjects compared to inion BST.
  • Ipsilateral BST showed lower or equal active motor threshold (AMT) and shorter onset latency in most subjects.

Conclusions:

  • The optimal stimulation site for BST varies significantly between individuals.
  • Ipsilateral BST is a more efficient stimulation site for a majority of subjects.
  • These findings can guide the selection of efficient BST sites for personalized neurostimulation.