Anodal tDCS over Broca's area improves fast mapping and explicit encoding of novel vocabulary

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Anodal tDCS over Broca's area improves fast mapping and explicit encoding of novel vocabulary. / Perikova, Ekaterina ; Blagovechtchenski, Evgeny ; Filippova, Margarita ; Shcherbakova, Olga ; Kirsanov, Alexander ; Shtyrov, Yury.

In: Neuropsychologia, Vol. 168, 108156, 15.04.2022.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{f9ee34f11dd94d7786e126688aaa1697,

title = "Anodal tDCS over Broca's area improves fast mapping and explicit encoding of novel vocabulary",

abstract = "An accumulating body of evidence suggests that transcranial direct current stimulation (tDCS) can be used to affect language processing, including word acquisition. There has been, however, no comprehensive study of effects of tDCS of the core language areas in relation to the main word-learning mechanisms. Two principal strategies have been posited as important for natural word acquisition: explicit encoding (EE) which relies on direct instructions and repetition of material, and fast mapping (FM) which operates implicitly, via context-based inference or deduction. We used anodal and cathodal tDCS of Broca's and Wernicke's areas to assess effects of stimulation site and polarity on novel word acquisition in both EE and FM regimes. 160 participants, divided into five groups, received 15 min of cathodal or anodal tDCS over one of the two areas or a sham (placebo) stimulation before learning eight novel words, presented ten times each in a short naturalistic audio-visual word-picture association session, fully counterbalanced across different learning regimes. The outcome of novel word acquisition was measured immediately after the training using a free recall task. The results showed elevated accuracy in all real stimulation groups in comparison with sham stimulation; however, this effect only reached full significance after anodal tDCS of Broca's area. Comparisons between the two learning modes indicated that Broca's anodal tDCS significantly improved both implicit and explicit acquisition of novel vocabulary in comparison with sham tDCS, without, however, any significant differences between EE and FM regimes as such. The results indicate involvement of the left inferior-frontal neocortex in the learning of novel vocabulary and suggest a possibility to promote different types of word acquisition using anodal tDCS of this area.",

keywords = "Acquisition, Broca's area, Explicit encoding (EE), Fast mapping (FM), Language, Learning, Memory, Transcranial direct current stimulation (tDCS), Word, Verbal Learning/physiology, Vocabulary, Transcranial Direct Current Stimulation/methods, Humans, Broca Area/physiology, Wernicke Area",

author = "Ekaterina Perikova and Evgeny Blagovechtchenski and Margarita Filippova and Olga Shcherbakova and Alexander Kirsanov and Yury Shtyrov",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = apr,

day = "15",

doi = "10.1016/j.neuropsychologia.2022.108156",

language = "English",

volume = "168",

journal = "Neuropsychologia",

issn = "0028-3932",

publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Anodal tDCS over Broca's area improves fast mapping and explicit encoding of novel vocabulary

AU - Perikova, Ekaterina

AU - Blagovechtchenski, Evgeny

AU - Filippova, Margarita

AU - Shcherbakova, Olga

AU - Kirsanov, Alexander

AU - Shtyrov, Yury

PY - 2022/4/15

Y1 - 2022/4/15

N2 - An accumulating body of evidence suggests that transcranial direct current stimulation (tDCS) can be used to affect language processing, including word acquisition. There has been, however, no comprehensive study of effects of tDCS of the core language areas in relation to the main word-learning mechanisms. Two principal strategies have been posited as important for natural word acquisition: explicit encoding (EE) which relies on direct instructions and repetition of material, and fast mapping (FM) which operates implicitly, via context-based inference or deduction. We used anodal and cathodal tDCS of Broca's and Wernicke's areas to assess effects of stimulation site and polarity on novel word acquisition in both EE and FM regimes. 160 participants, divided into five groups, received 15 min of cathodal or anodal tDCS over one of the two areas or a sham (placebo) stimulation before learning eight novel words, presented ten times each in a short naturalistic audio-visual word-picture association session, fully counterbalanced across different learning regimes. The outcome of novel word acquisition was measured immediately after the training using a free recall task. The results showed elevated accuracy in all real stimulation groups in comparison with sham stimulation; however, this effect only reached full significance after anodal tDCS of Broca's area. Comparisons between the two learning modes indicated that Broca's anodal tDCS significantly improved both implicit and explicit acquisition of novel vocabulary in comparison with sham tDCS, without, however, any significant differences between EE and FM regimes as such. The results indicate involvement of the left inferior-frontal neocortex in the learning of novel vocabulary and suggest a possibility to promote different types of word acquisition using anodal tDCS of this area.

AB - An accumulating body of evidence suggests that transcranial direct current stimulation (tDCS) can be used to affect language processing, including word acquisition. There has been, however, no comprehensive study of effects of tDCS of the core language areas in relation to the main word-learning mechanisms. Two principal strategies have been posited as important for natural word acquisition: explicit encoding (EE) which relies on direct instructions and repetition of material, and fast mapping (FM) which operates implicitly, via context-based inference or deduction. We used anodal and cathodal tDCS of Broca's and Wernicke's areas to assess effects of stimulation site and polarity on novel word acquisition in both EE and FM regimes. 160 participants, divided into five groups, received 15 min of cathodal or anodal tDCS over one of the two areas or a sham (placebo) stimulation before learning eight novel words, presented ten times each in a short naturalistic audio-visual word-picture association session, fully counterbalanced across different learning regimes. The outcome of novel word acquisition was measured immediately after the training using a free recall task. The results showed elevated accuracy in all real stimulation groups in comparison with sham stimulation; however, this effect only reached full significance after anodal tDCS of Broca's area. Comparisons between the two learning modes indicated that Broca's anodal tDCS significantly improved both implicit and explicit acquisition of novel vocabulary in comparison with sham tDCS, without, however, any significant differences between EE and FM regimes as such. The results indicate involvement of the left inferior-frontal neocortex in the learning of novel vocabulary and suggest a possibility to promote different types of word acquisition using anodal tDCS of this area.

KW - Acquisition

KW - Broca's area

KW - Explicit encoding (EE)

KW - Fast mapping (FM)

KW - Language

KW - Learning

KW - Memory

KW - Transcranial direct current stimulation (tDCS)

KW - Word

KW - Verbal Learning/physiology

KW - Vocabulary

KW - Transcranial Direct Current Stimulation/methods

KW - Humans

KW - Broca Area/physiology

KW - Wernicke Area

UR - http://www.scopus.com/inward/record.url?scp=85124588860&partnerID=8YFLogxK

U2 - 10.1016/j.neuropsychologia.2022.108156

DO - 10.1016/j.neuropsychologia.2022.108156

M3 - Article

C2 - 35026217

AN - SCOPUS:85124588860

VL - 168

JO - Neuropsychologia

JF - Neuropsychologia

SN - 0028-3932

M1 - 108156

ER -

ID: 95022172