• Jose Gomez-Tames, Akihiro Asai, and Akimasa Hirata.
• Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Aichi 466-8555, Japan. Electronic address: jgomez@nitech.ac.jp.
• Clin Neurophysiol. 2020 Mar 1; 131 (3): 755-765.

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.Copyright © 2019 International Federation of Clinical Neurophysiology. Published by Elsevier B.V. All rights reserved.

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