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Modulation of corticospinal excitability by repetitive transcranial magnetic stimulation

Maeda, Fumiko, Keenan, Julian Paul, Tormos, Jose Maria, Topka, Helge, Pascual-Leone, Alvaro·2000·Clinical Neurophysiology
DOI 10.1016/s1388-2457(99)00323-5
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Abstract

Objective Repetitive transcranial magnetic stimulation (rTMS) is able to modulate the corticospinal excitability and the effects appear to last beyond the duration of the rTMS itself. Different studies, employing different rTMS parameters, report different modulation of corticospinal excitability ranging from inhibition to facilitation. Intraindividual variability of these effects and their reproducibility are unclear. Methods We examined the modulatory effects of rTMS to the motor cortex at various frequencies (1, 10, 20 Hz) and at different time-points in twenty healthy volunteers. Results We observed significant inhibition of MEPs following 1 Hz rTMS and significant facilitation of MEPs following 20 Hz rTMS for both day1 and day 2. Interestingly, at 1 Hz and 20 Hz rTMS, the modulatory effect produced by rTMS was greater on day 2. However, there was no significant change in corticospinal excitability following 10 Hz rTMS neither on day 1 nor day 2. Conclusion Our findings raise questions as to how stimulation parameters should be determined when conducting studies applying rTMS on multiple days, and in particular, studies exploring rTMS as a treatment modality in neuropsychiatric disorders.

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Crossref · 10.1016/s1388-2457(99)00323-5

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  • The rTMS parameters used were within currently recommended safety guidelines and were expected to modify DLPFc perfusion for 14 min and reduce excitability of the targeted cortical region for several minutes after the train.

    “The rTMS parameters were well within currently recommended guidelines (Rossi et al., 2009), resulting in an estimated modification of DLPFc perfusion for 14 min (Eisenegger et al., 2008) and in a reduction of excitability of the targeted cortical region for several minutes following completion of the rTMS train (Maeda et al., 2000).”

    From Disrupting the right prefrontal cortex alters moral judgement (2012) · cites this paper as Maeda et al., 2000

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Metadata

Authors
Maeda, F., Keenan, J. P., Tormos, J. M., Topka, H., & Pascual-Leone, A.
Venue
Clinical Neurophysiology
Publisher
Elsevier BV
Published
2000-05
Volume
111
Issue
5
Pages
800-805
ISSN
1388-2457
DOI
10.1016/s1388-2457(99)00323-5
Cited by
618
References
2
Language
en
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