Research Article
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Published Online: 9 May 2019

Low- and High-Frequency Repetitive Transcranial Magnetic Stimulation Effects on Resting-State Functional Connectivity Between the Postcentral Gyrus and the Insula

Publication: Brain Connectivity
Volume 9, Issue Number 4

Abstract

The insular cortex supports the conscious awareness of physical and emotional sensations, and the ability to modulate the insula could have important clinical applications in psychiatry. Repetitive transcranial magnetic stimulation (rTMS) uses transient magnetic fields to induce electrical currents in the superficial cortex. Given its deep location in the brain, the insula may not be directly stimulated by rTMS; however, rTMS may modulate the insula via its functional connections with superficial cortical regions. Furthermore, low- versus high-frequency rTMS is thought to have opposing effects on cortical excitability, and the present study investigated these effects on brain activity and functional connectivity with the insula. Separate groups of healthy participants (n = 14 per group) received low (1 Hz)- or high (10 Hz)-frequency rTMS in five daily sessions to the right postcentral gyrus, a superficial region known to be functionally connected to the insula. Resting-state functional connectivity (RSFC) was measured pre- and post-rTMS. Both 1 and 10 Hz rTMS increased RSFC between the right postcentral gyrus and the left insula. These results suggest that low- and high-frequency rTMS has similar long-term effects on brain activity and RSFC. However, given the lack of difference, we cannot exclude the possibility that these effects are simply due to a nonspecific effect. Given this limitation, these unexpected results underscore the need for acoustic- and stimulation-matched sham control conditions in rTMS research.

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cover image Brain Connectivity
Brain Connectivity
Volume 9Issue Number 4May 2019
Pages: 322 - 328
PubMed: 30773890

History

Published online: 9 May 2019
Published in print: May 2019
Published ahead of print: 2 April 2019
Published ahead of production: 16 February 2019

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Merideth A. Addicott [email protected]
Department of Psychiatry, Psychiatric Research Institute, University of Arkansas for Medical Sciences, Little Rock, Arkansas.
Bruce Luber
National Institute of Mental Health, Bethesda, Maryland.
Duy Nguyen
Department of Psychiatry and Behavioral Science, Duke University School of Medicine, Durham, North Carolina.
Hannah Palmer
Department of Psychiatry and Behavioral Science, Duke University School of Medicine, Durham, North Carolina.
Sarah H. Lisanby
National Institute of Mental Health, Bethesda, Maryland.
Lawrence Gregory Appelbaum
Department of Psychiatry and Behavioral Science, Duke University School of Medicine, Durham, North Carolina.

Notes

Address correspondence to: Merideth A. Addicott, Department of Psychiatry, Psychiatric Research Institute, University of Arkansas for Medical Sciences, 4301 W. Markham Street, No. 843, Little Rock, AR 72205-7199 [email protected]

Author Disclosure Statement

The authors report no competing financial interests exist.

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