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Related Experiment Video

Updated: Aug 19, 2025

Repetitive Transcranial Magnetic Stimulation to the Unilateral Hemisphere of Rat Brain
05:47

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Transcranial magnetic stimulation set-up for small animals.

Jaakko O Nieminen1,2,3, Alexey S Pospelov4,5,6, Lari M Koponen1

  • 1Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, Espoo, Finland.

Frontiers in Neuroscience
|November 28, 2022
PubMed
Summary

Researchers developed a novel setup for Transcranial Magnetic Stimulation (TMS) in rats, overcoming challenges with small animal head sizes. This innovation enables consistent motor evoked potential recordings for neurophysiological studies.

Keywords:
TMScoilelectromyographyholderrattranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Biomedical Engineering

Background:

  • Transcranial Magnetic Stimulation (TMS) is crucial for human research and clinical applications.
  • Adapting TMS for small animal models, like rodents, is vital for understanding neurophysiological mechanisms but presents technical challenges due to small head size.

Purpose of the Study:

  • To design an energy-efficient coil and a specialized experimental setup for effective TMS administration in rodents.
  • To overcome the technical difficulties associated with applying TMS to small animal models.

Main Methods:

  • Utilized a convex optimization process to engineer a minimum-energy TMS coil specifically for rats.
  • Developed a custom holder enabling rats to lie upside down, with their heads positioned within the coil.
  • Recorded TMS-electromyography (EMG) from limb muscles using intramuscular electrodes.

Main Results:

  • The optimized coil and setup facilitated consistent motor evoked potential (MEP) recordings across all tested rats.
  • The upside-down rat placement improved operator accessibility and TMS navigation by preventing visual obstruction.

Conclusions:

  • The developed TMS coil and experimental setup provide a viable and effective method for rodent studies.
  • This approach enhances the feasibility of investigating neurophysiological mechanisms using TMS in small animal models.