Dorsolateral Prefrontal Transcranial Direct Current Stimulation Modulates Language Processing but Does Not Facilitate Overt Second Language Word Production.

Details

Serval ID
serval:BIB_82A17B50FEFF
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Dorsolateral Prefrontal Transcranial Direct Current Stimulation Modulates Language Processing but Does Not Facilitate Overt Second Language Word Production.
Journal
Frontiers in neuroscience
Author(s)
Radman N., Britz J., Buetler K., Weekes B.S., Spierer L., Annoni J.M.
ISSN
1662-4548 (Print)
ISSN-L
1662-453X
Publication state
Published
Issued date
2018
Peer-reviewed
Oui
Volume
12
Pages
490
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
Word retrieval in bilingual speakers partly depends on executive control systems in the left prefrontal cortex - including dorsolateral prefrontal cortex (DLPFC). We tested the hypothesis that DLPFC modulates word production of words specifically in a second language (L2) by measuring the effects of anodal transcranial direct current stimulation (anodal-tDCS) over the DLPFC on picture naming and word translation and on event-related potentials (ERPs) and their sources. Twenty-six bilingual participants with "unbalanced" proficiency in two languages were given 20 min of 1.5 mA anodal or sham tDCS (double-blind stimulation design, counterbalanced stimulation order, 1-week intersession delay). The participants then performed the following tasks: verbal and non-verbal fluency during anodal-tDCS stimulation and first and second language (L1 and L2) picture naming and translation [forward (L1 → L2) and backward (L2 → L1)] immediately after stimulation. The electroencephalogram (EEG) was recorded during picture naming and translation. On the behavioral level, anodal-tDCS had an influence on non-verbal fluency but neither on verbal fluency, nor on picture naming and translation. EEG measures revealed significant interactions between Language and Stimulation on picture naming around 380 ms post-stimulus onset and Translation direction and Stimulation on translation around 530 ms post-stimulus onset. These effects suggest that L2 phonological retrieval and phoneme encoding are spatially and temporally segregated in the brain. We conclude that anodal-tDCS stimulation has an effect at a neural level on phonological processes and, critically, that DLPFC-mediated activation is a constraint on language production specifically in L2.
Keywords
EEG/ERP, bilingualism, dorsolateral prefrontal cortex, language production, tDCS
Pubmed
Web of science
Open Access
Yes
Create date
18/08/2018 8:16
Last modification date
20/08/2019 14:42
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