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Differences in Electric Field Strength between Clinical and Non-Clinical Populations Induced by Prefrontal Tdcs: A Cross-Diagnostic, Individual MRI Based Modeling Study

Differences in Electric Field Strength between Clinical and Non-Clinical Populations Induced by Prefrontal Tdcs: A Cross-Diagnostic, Individual MRI Based Modeling Study

Authors :
Yuki Mizutani-Tiebel
Shun Takahashi
Temmuz Karali
Eva Mezger
Lucia Bulubas
Irina Papazova
Esther Dechantsreiter
Sophia Stoecklein
Boris Papazov
Axel Thielscher
Frank Padberg
Daniel Keeser
Source :
Mizutani-Tiebel, Y, Takahashi, S, Karali, T, Mezger, E, Bulubas, L, Papazova, I, Dechantsreiter, E, Stoecklein, S, Papazov, B, Thielscher, A, Padberg, F & Keeser, D 2022, ' Differences in electric field strength between clinical and non-clinical populations induced by prefrontal tDCS: A cross-diagnostic, individual MRI-based modeling study ', NeuroImage: Clinical, vol. 34, 103011 . https://doi.org/10.1016/j.nicl.2022.103011
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

Introduction: Prefrontal cortex (PFC) regions are promising targets for therapeutic applications of non-invasive brain stimulation, e.g. transcranial direct current stimulation (tDCS), which has been proposed as a novel intervention for major depressive disorder (MDD) and negative symptoms of schizophrenia (SCZ). However, the effects of tDCS vary inter-individually, and dose–response relationships have not been established. Stimulation parameters are often tested in healthy subjects and transferred to clinical populations. The current study investigates the variability of individual MRI-based electric fields (e-fields) of standard bifrontal tDCS across individual subjects and diagnoses. Method: The study included 74 subjects, i.e. 25 patients with MDD, 24 patients with SCZ, and 25 healthy controls (HC). Individual e-fields of a common tDCS protocol (i.e. 2 mA stimulation intensity, bifrontal anode-F3/cathode-F4 montage) were modeled by two investigators using SimNIBS (2.0.1) based on structural MRI scans. Result: On a whole-brain level, the average e-field strength was significantly reduced in MDD and SCZ compared to HC, but MDD and SCZ did not differ significantly. Regions of interest (ROI) analysis for PFC subregions showed reduced e-fields in Sallet areas 8B and 9 for MDD and SCZ compared to HC, whereas there was again no difference between MDD and SCZ. Within groups, we generally observed high inter-individual variability of e-field intensities at a higher percentile of voxels. Conclusion: MRI-based e-field modeling revealed significant differences in e-field strengths between clinical and non-clinical populations in addition to a general inter-individual variability. These findings support the notion that dose–response relationships for tDCS cannot be simply transferred from healthy to clinical cohorts and need to be individually established for clinical groups. In this respect, MRI-based e-field modeling may serve as a proxy for individualized dosing.

Details

ISSN :
15565068
Database :
OpenAIRE
Journal :
SSRN Electronic Journal
Accession number :
edsair.doi.dedup.....8752e869c0e89ff61ad3f1cc2bf0dffe
Full Text :
https://doi.org/10.2139/ssrn.3993003