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Cortico-cortical modulation induced by 1-Hz repetitive transcranial magnetic stimulation of the temporal cortex.

Authors
Lee, M; Kim, SE; Kim, WS; Han, J; Kim, HJ; Kim, BS; Kim, JY; Hong, SB; Kim, BG; Lee, HW
Citation
Journal of clinical neurology (Seoul, Korea), 9(2):75-82, 2013
Journal Title
Journal of clinical neurology (Seoul, Korea)
ISSN
1738-65862005-5013
Abstract
BACKGROUND AND PURPOSE: Repetitive transcranial magnetic stimulation (rTMS) has potential as a noninvasive neuromodulation treatment method for various neuropsychiatric disorders, and repeated sessions of rTMS are more likely to enhance the therapeutic efficacy. This study investigated neurophysiologic and spatiodynamic changes induced by repeated 1-Hz rTMS of the temporal cortex using transcranial magnetic stimulation (TMS) indices and fluorodeoxyglucose positron emission tomography (FDG-PET).



METHODS: Twenty-seven healthy subjects underwent daily 1-Hz active or sham rTMS of the right temporal cortex for 5 consecutive days. TMS indices of motor cortical excitability were measured in both hemispheres daily before and after each rTMS session, and 2 weeks after the last stimulation. FDG-PET was performed at baseline and after the 5 days of rTMS sessions.



RESULTS: All subjects tolerated all of the sessions well, with only three of them (11.1%) reporting mild transient side effects (i.e., headache, tinnitus, or local irritation). One-Hz rTMS decreased motor evoked potential amplitudes and delayed cortical silent periods in the stimulated hemisphere. Statistical parametric mapping of FDG-PET data revealed a focal reduction of glucose metabolism in the stimulated temporal area and an increase in the bilateral precentral, ipsilateral superior and middle frontal, prefrontal and cingulate gyri.



CONCLUSIONS: Repeated rTMS sessions for 5 consecutive days were tolerated in all subjects, with only occasional minor side effects. Focal 1-Hz rTMS of the temporal cortex induces cortico-cortical modulation with widespread functional changes in brain neural networks via long-range neural connections.
Keywords
cortical excitabilitycortico-cortical modulationfluorodeoxyglucose positron emission tomography (FDG-PET)repetitive transcranial magnetic stimulation (rTMS)
DOI
10.3988/jcn.2013.9.2.75
PMID
23626644
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Brain Science
AJOU Authors
김, 병곤
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