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@ARTICLE{Riemann:271063,
author = {Riemann, Steffen and van Lück, Jil and
Rodríguez-Fornells, Antoni and Flöel, Agnes and Meinzer,
Marcus},
title = {{T}he role of frontal cortex in novel-word learning and
consolidation: {E}vidence from focal transcranial direct
current stimulation.},
journal = {Cortex},
volume = {177},
issn = {0010-9452},
address = {New York, NY},
publisher = {Elsevier},
reportid = {DZNE-2024-00935},
pages = {15 - 27},
year = {2024},
abstract = {Previous studies have demonstrated that conventional
transcranial direct current stimulation (tDCS) can enhance
novel-word learning. However, because of the widespread
current that is induced by these setups and lack of
appropriate control conditions, little is known about the
underlying neural mechanisms. In the present double-blinded
and sham-tDCS controlled study, we investigated for the
first time if regionally precise focal tDCS targeting two
key nodes of the novel-word learning network at different
time points would result in regionally and temporally
distinct effects. 156 participants completed a contextual
novel-word-learning paradigm and learning success was probed
immediately after the acquisition period and 30-min later.
Participants were randomly assigned to six stimulation
conditions: Active tDCS (1.5 mA) was administered to left
inferior frontal (IFG) or middle temporal gyrus (MTG),
either during acquisition or delayed recall. Control groups
received sham-tDCS either during acquisition or delayed
recall $(50\%$ IFG/MTG). Data were analyzed with a
generalized linear mixed model with a binomial link function
in a Bayesian framework. Our results showed that frontal
tDCS selectively increased accuracy gains from immediate to
delayed recall, irrespective of timing of the stimulation.
There was no evidence for beneficial effects of middle
temporal gyrus tDCS. Our findings confirm that IFG tDCS can
enhance novel-word learning in a regionally, but not timing
specific way. Tentatively, this may be explained by
enhancement of semantic selection processes resulting in
more effective consolidation and/or retrieval. Future
studies using longer time intervals between assessments are
required to clarify the potential contribution of
neurophysiological after-effects of IFG tDCS administered
during acquisition to enhanced consolidation.},
keywords = {Humans / Transcranial Direct Current Stimulation: methods /
Male / Female / Adult / Frontal Lobe: physiology / Young
Adult / Learning: physiology / Double-Blind Method / Mental
Recall: physiology / Temporal Lobe: physiology / Memory
Consolidation: physiology / Inferior frontal gyrus (Other) /
Middle temporal gyrus (Other) / Novel word learning (Other)
/ Regional specificity (Other) / Temporal specificity
(Other) / focal tDCS (Other)},
cin = {AG Flöel},
ddc = {610},
cid = {I:(DE-2719)5000081},
pnm = {353 - Clinical and Health Care Research (POF4-353)},
pid = {G:(DE-HGF)POF4-353},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:38824804},
doi = {10.1016/j.cortex.2024.05.004},
url = {https://pub.dzne.de/record/271063},
}