Low- and High-Frequency Repetitive Transcranial Magnetic Stimulation Effects on Resting-State Functional Connectivity Between the Postcentral Gyrus and the Insula.
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2019-05
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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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Addicott, Merideth A, Bruce Luber, Duy Nguyen, Hannah Palmer, Sarah H Lisanby and Lawrence Gregory Appelbaum (2019). Low- and High-Frequency Repetitive Transcranial Magnetic Stimulation Effects on Resting-State Functional Connectivity Between the Postcentral Gyrus and the Insula. Brain connectivity, 9(4). pp. 322–328. 10.1089/brain.2018.0652 Retrieved from https://hdl.handle.net/10161/20728.
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Sarah Hollingsworth Lisanby
Sarah Hollingsworth “Holly” Lisanby, MD, is an experienced translational researcher and innovator of neuromodulation technologies to study and treat psychiatric disorders. Dr. Lisanby is Director of the Division of Translational Research at NIMH, which funds research on the discovery of preventions, treatments, and cures for mental illness across the lifespan. She is Founder and Director of the Noninvasive Neuromodulation Unit in the NIMH Intramural Research Program, a multi-disciplinary clinical research program specializing in the innovation of new brain stimulation tools to measure and modulate neuroplasticity to improve mental health. Dr. Lisanby is former Chair of the Duke Department of Psychiatry & Behavioral Sciences, and JP Gibbons Endowed Professor at Duke University. She founded and directed both the Duke and the Columbia University Divisions of Brain Stimulation, where she built interdisciplinary research programs specializing in the convergence of Psychiatry, Neuroscience and Engineering. She co-led the NIH BRAIN Initiative Team focused on large-scale neural recording and modulation devices. Dr. Lisanby has been principal investigator on a series of federally funded grants on the development of novel neuromodulation technologies, including the rational design of magnetic and electrical seizure therapies. Her team pioneered magnetic seizure therapy (MST) as a novel depression treatment from the stages of animal testing, first-in-human, and international clinical trials. She led a series of studies involving transcranial magnetic stimulation, electroconvulsive therapy (ECT), MST, vagus nerve stimulation, and deep brain stimulation. She has received numerous international recognitions, including the Max Hamilton Memorial Prize of the Collegium Internationale Neuro-Psychopharmacologicum, the Gerald Klerman Award from the National Depression and Manic Depression Association, and the Eva King Killam Research Award from the American College of Neuropsychopharmacology. She has been a member of the NIMH Board of Scientific Counselors. Dr. Lisanby served on the FDA Neurological Devices Advisory Panel and has held key leadership positions with numerous professional associations, including serving as President for the Association for Convulsive Therapy/International Society of Neurostimulation, and the International Society for Transcranial Stimulation, and Chair of the American Psychiatric Association Task Force to Revise the Practice on ECT.
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