Significant group-level hotspots found in deep brain regions during transcranial direct current stimulation (tDCS): A computational analysis of electric fields |
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| Affiliation: | 1. Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Aichi 466-8555, Japan;2. Center of Biomedical Physics and Information Technology, Nagoya Institute of Technology, Nagoya, Aichi 466-8555, Japan;1. Aalto University, Department of Electrical Engineering and Automation, Finland;2. Hamamatsu University School of Medicine, Japan;3. Nagoya Institute of Technology, Department of Electrical and Mechanical Engineering, Japan;1. Department of Psychiatry and Psychotherapy, University Hospital, LMU, Nussbaumstrasse 7, 80336 Munich, Germany;2. Department of Psychological Methodology and Assessment, LMU, Leopoldstrasse 13, 80802 Munich, Germany;3. Hochschule Fresenius, University of Applied Sciences, Infanteriestrasse 11a, 80797 Munich, Germany;4. Department of Psychiatry and Psychotherapy, Neurophysiology & Interventional, Neuropsychiatry and Werner Reichardt Center for Integrative Neuroscience (CIN), University of Tübingen, Calwerstrasse 14, 72076 Tübingen, Germany;5. Department of Radiology, LMU, Marchioninistrasse 15, 81377 Munich, Germany |
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| Abstract: | ObjectiveTranscranial direct current stimulation (tDCS) is a neuromodulation scheme that delivers a small current via electrodes placed on the scalp. The target is generally assumed to be under the electrode, but deep brain regions could also be involved due to the large current spread between the electrodes. This study aims to computationally evaluate if group-level hotspots exist in deep brain regions for different electrode montages.MethodsWe computed the tDCS-generated electric fields (EFs) in a group of subjects using interindividual registration methods that permitted the projection of EFs from individual realistic head models (n = 18) to a standard deep brain region.ResultsThe spatial distribution and peak values (standard deviation of 14%) of EFs varied significantly. Nevertheless, group-level EF hotspots appeared in deep brain regions. The caudate had the highest field peaks in particular for F3-F4 montage (70% of maximum cortical EF), while other regions reach field peaks of 50%.ConclusionstDCS at deeper regions may include not only modulation via underlying cortical or subcortical circuits but also modulation of deep brain regions.SignificanceThe presented EF atlas in deep brain regions can be used to explain tDCS mechanism or select the most appropriate tDCS montage. |
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| Keywords: | Transcranial direct current stimulation Deep brain stimulation Interindividual variability Computational model Electric field Group-level |
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