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Related Experiment Video

Updated: Aug 19, 2025

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
09:52

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Published on: February 23, 2020

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Precise motor mapping with transcranial magnetic stimulation.

Konstantin Weise1,2, Ole Numssen3, Benjamin Kalloch4,5

  • 1Methods and Development Group 'Brain Networks', Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany. kweise@cbs.mpg.de.

Nature Protocols
|December 2, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a precise method using transcranial magnetic stimulation (TMS) to map motor cortex representations. This technique links electric fields to muscle responses, enabling personalized TMS dosing for better brain stimulation outcomes.

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Area of Science:

  • Neuroscience
  • Neurophysiology
  • Biophysics

Background:

  • Precise localization of cortical muscle representations is crucial for understanding brain function and optimizing neuromodulation techniques.
  • Current methods may lack the precision needed for individualized therapeutic applications of transcranial magnetic stimulation (TMS).

Purpose of the Study:

  • To develop and validate a routine for precisely localizing cortical muscle representations in the primary motor cortex using TMS.
  • To establish a foundation for TMS dosing metrics based on subject-specific cortical electric field thresholds.

Main Methods:

  • Combining transcranial magnetic stimulation (TMS) with motor-evoked potential (MEP) recordings and computational electric field modeling.
  • Utilizing individual head models derived from magnetic resonance imaging (MRI) for accurate electric field calculations.
  • Relating TMS-induced electric fields to MEP amplitudes to pinpoint the cortical origin of muscle responses.

Main Results:

  • A routine was established to precisely map cortical muscle representations by correlating induced electric fields with MEPs.
  • The method allows for the determination of optimal coil positions for stimulating identified cortical origins.
  • The protocol integrates neuroimaging, neurophysiology, and computational modeling for personalized brain mapping.

Conclusions:

  • This routine provides a precise method for localizing cortical muscle representations within the primary motor cortex.
  • The findings support the development of subject-specific TMS dosing metrics based on electric field thresholds.
  • The protocol is feasible with standard TMS equipment and basic computational expertise, paving the way for advanced neuromodulation strategies.