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Very low-frequency rTMS modulates SEPs over the contralateral hemisphere.

Haruo Uguisu1, Ryo Urushihara, Yuki Hosono

  • 1Department of Neurology, Institute of Health Biosciences, University of Tokushima Graduate School, Tokushima, Japan.

The Journal of Medical Investigation : JMI
|March 20, 2010
PubMed
Summary

Investigating repetitive transcranial magnetic stimulation (rTMS), this study found that very low-frequency rTMS over the right motor cortex significantly increased contralateral somatosensory evoked potentials (SEPs), suggesting transcallosal pathway involvement.

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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Electrophysiology

Background:

  • Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive brain stimulation technique.
  • Understanding the precise pathways affected by rTMS is crucial for its therapeutic applications.
  • The transcallosal pathway facilitates interhemispheric communication between the two cerebral hemispheres.

Purpose of the Study:

  • To investigate the transcallosal effects of very low-frequency rTMS on brain activity.
  • To determine if rTMS applied to the motor cortex influences contralateral sensory processing.
  • To examine the impact of monophasic, subthreshold rTMS on median somatosensory evoked potentials (SEPs).

Main Methods:

  • Twelve healthy subjects underwent median nerve stimulation to elicit SEPs.

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  • Monophasic, very low-frequency (0.2 Hz) subthreshold rTMS was applied over the right motor cortex.
  • Sham rTMS was used as a control condition.
  • SEPs were recorded before and after rTMS application.

    • Main Results:

    • A significant increase in the N34 component amplitude of right median SEPs was observed.
    • These SEPs were recorded from the left parietal scalp (C3') following right hemisphere rTMS.
    • No significant changes were noted in other SEP components or after sham stimulation.

    Conclusions:

    • Very low-frequency subthreshold rTMS over the motor cortex primarily impacts contralateral SEPs.
    • These findings suggest that rTMS influences interhemispheric communication, likely via the transcallosal pathway.
    • The study provides evidence for the modulatory effects of rTMS on sensory pathways.