Publication: Lack of Target Engagement Following Low-Frequency Deep Transcranial Magnetic Stimulation of the Anterior Insula
Issued Date
2018-01-01
ISSN
15251403
10947159
10947159
Other identifier(s)
2-s2.0-85055718863
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Neuromodulation. (2018)
Suggested Citation
Primavera A. Spagnolo, Han Wang, Prachaya Srivanitchapoom, Melanie Schwandt, Markus Heilig, Mark Hallett Lack of Target Engagement Following Low-Frequency Deep Transcranial Magnetic Stimulation of the Anterior Insula. Neuromodulation. (2018). doi:10.1111/ner.12875 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/47227
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Lack of Target Engagement Following Low-Frequency Deep Transcranial Magnetic Stimulation of the Anterior Insula
Abstract
© 2018 International Neuromodulation Society Objective: To evaluate the safety and efficacy of low-frequency, inhibitory, deep rTMS with a novel H-coil specifically designed to stimulate the insula. Methods: In a randomized, crossover order, 16 healthy volunteers underwent two sessions (sham; active) of 1 Hz repetitive TMS at an intensity of 120% of individual motor threshold, over the right anterior insular cortex localized using a neuronavigation system. Before, immediately after, and one hour after rTMS, subjects performed two tasks that have previously been shown in fMRI experiments to activate insular cortex: A blink suppression task and a forced-choice risk-taking task. Results: No drop-outs or adverse events occurred. Active deep rTMS did not result in decreased urge to blink compared to sham. Similarly, no significant time × condition interaction on risk-taking behavior was found. Conclusions: Low-frequency deep rTMS using a novel H8 coil was shown to be safe but did not affect any of the behavioral markers, also used to investigate modulation of insula activity. Our findings highlight the challenges of modulating the activity of deep brain regions with TMS. Further studies are necessary to identify effective stimulation parameters for deep targets, and to characterize the effects of deep TMS on overlying cortical regions.