4.6 Article

Low-frequency repetitive transcranial magnetic stimulation suppresses specific excitatory circuits in the human motor cortex

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JOURNAL OF PHYSIOLOGY-LONDON
卷 586, 期 18, 页码 4481-4487

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WILEY-BLACKWELL
DOI: 10.1113/jphysiol.2008.159558

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  1. MRC [G0500258] Funding Source: UKRI
  2. Medical Research Council [G0500258] Funding Source: researchfish
  3. Medical Research Council [G0500258] Funding Source: Medline

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Previous studies have shown that low-frequency repetitive transcranial magnetic stimulation (rTMS) suppresses motor-evoked potentials (MEPs) evoked by single pulse TMS. The aim of the present paper was to investigate the central nervous system level at which rTMS produces a suppression of MEP amplitude. We recorded corticospinal volleys evoked by single pulse TMS of the motor cortex before and after 1 Hz rTMS in five conscious subjects who had an electrode implanted in the cervical epidural space for the control of pain. One of the patients had Parkinson's disease and was studied on medication. Repetitive TMS significantly suppressed the amplitude of later I-waves, and reduced the amplitude of concomitantly recorded MEPs. The earliest I-wave was not significantly modified by rTMS. The present results show that 1 Hz rTMS may decrease the amplitude of later descending waves, consistent with a cortical origin of the effect of 1 Hz rTMS on MEPs.

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