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| Home > Articles > Published articles > Multifocal Transcranial Direct Current Stimulation Modulates Resting-State Functional Connectivity in Older Adults Depending on the Induced Current Density |
(Institut d'Investigacions Biomèdiques August Pi i Sunyer) (Institut d'Investigacions Biomèdiques August Pi i Sunyer) (Institut d'Investigacions Biomèdiques August Pi i Sunyer) (Institut d'Investigacions Biomèdiques August Pi i Sunyer) (Universitat de Barcelona) (Neuroelectrics (Barcelona)) (Neuroelectrics (Barcelona)) (Institut Germans Trias i Pujol. Institut Guttmann) (Institut Germans Trias i Pujol. Institut Guttmann)| Date: | 2021 |
| Abstract: | Combining non-invasive brain stimulation (NIBS) with resting-state functional magnetic resonance imaging (rs-fMRI) is a promising approach to characterize and potentially optimize the brain networks subtending cognition that changes as a function of age. However, whether multifocal NIBS approaches are able to modulate rs-fMRI brain dynamics in aged populations, and if these NIBS-induced changes are consistent with the simulated electric current distribution on the brain remains largely unknown. In the present investigation, thirty-one cognitively healthy older adults underwent two different multifocal real transcranial direct current stimulation (tDCS) conditions (C1 and C2) and a sham condition in a crossover design during a rs-fMRI acquisition. The real tDCS conditions were designed to electrically induce two distinct complex neural patterns, either targeting generalized frontoparietal cortical overactivity (C1) or a detachment between the frontal areas and the posteromedial cortex (C2). Data revealed that the two tDCS conditions modulated rs-fMRI differently. C1 increased the coactivation of multiple functional couplings as compared to sham, while a smaller number of connections increased in C1 as compared to C2. At the group level, C1-induced changes were topographically consistent with the calculated electric current density distribution. At the individual level, the extent of tDCS-induced rs-fMRI modulation in C1 was related with the magnitude of the simulated electric current density estimates. These results highlight that multifocal tDCS procedures can effectively change rs-fMRI neural functioning in advancing age, being the induced modulation consistent with the spatial distribution of the simulated electric current on the brain. Moreover, our data supports that individually tailoring NIBS-based interventions grounded on subject-specific structural data might be crucial to increase tDCS potential in future studies amongst older adults. |
| Grants: | Ministerio de Economía y Competitividad PSI2015-64227-R Agencia Estatal de Investigación RTI2018-095181-B-C21 "la Caixa" Foundation 100010434 European Commission 732592 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-748 |
| Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Subject: | Aging ; Electric current density ; Multifocal transcranial direct current stimulation ; Resting-state functional magnetic resonance imaging ; Non-invasive brain stimulation (NIBS) ; Electric modeling ; Neuroimaging |
| Published in: | Frontiers in aging neuroscience, Vol. 13 (november 2021) , ISSN 1663-4365 |
