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A Transcranial Magnetic Stimulation Trigger System for Suppressing Motor-Evoked Potential Fluctuation Using

Keisuke Sasaki1, Yuki Fujishige2, Yutaka Kikuchi3

  • 1Department of Environment and Life Engineering, Graduate School of Maebashi Institute of Technology, Maebashi, Japan.

JMIR Biomedical Engineering
|June 22, 2024
PubMed
Summary
This summary is machine-generated.

We developed a transcranial magnetic stimulation (TMS) triggering system that uses electroencephalogram (EEG) coherence to suppress motor-evoked potential (MEP) fluctuations. This system also stabilizes experimental timing, improving TMS application reliability.

Keywords:
coefficient of variationcoherenceelectroencephalogramfluctuationmotor-evoked potentialprimary motor cortexthresholdtranscranial magnetic stimulationtriggervariability

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Transcranial magnetic stimulation (TMS) elicits motor-evoked potentials (MEPs) in peripheral muscles.
  • MEP amplitude exhibits trial-to-trial fluctuations due to cortical instability.
  • These fluctuations are hypothesized to originate from unstable brain activity.

Purpose of the Study:

  • To develop a TMS triggering system to suppress MEP fluctuations.
  • To utilize electroencephalogram (EEG) coherence analysis for detecting EEG signal similarity.
  • To improve the reliability and consistency of TMS applications.

Main Methods:

  • A TMS triggering system was developed, incorporating EEG coherence analysis.
  • Seven healthy adults participated in the study.
  • MEP amplitude variation and experimental time were compared between the developed system and a control task.

Main Results:

  • The coefficient of variation for MEP amplitude decreased in 5 out of 7 participants.
  • Significant differences in MEP variation were observed in 2 participants (P=.02).
  • The TMS triggering system significantly reduced experimental time variation (P<.001).

Conclusions:

  • The developed TMS triggering system effectively suppresses MEP fluctuations.
  • The system enhances the stability of experimental timing through automatic threshold adjustments.
  • This approach offers improved precision and reliability for TMS studies.