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Individual differences in bilingual experience modulate executive control network and performance: Behavioral and structural neuroimaging evidence

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DOI

  • Federico Gallo, Higher School of Economics, Vita-Salute San Raffaele University
  • ,
  • Nikolay Novitskiy, Chinese University of Hong Kong
  • ,
  • Andriy Myachykov, Higher School of Economics, Northumbria University
  • ,
  • Yury Shtyrov

Dual/multiple language use has been shown to affect cognition and its neural substrate, although the replicability of such findings varies, partially due to neglecting the role of interindividual variability in bilingual experience. To address this, we operationalized the main bilingual experience factors as continuous variables, investigating their effects on executive control performance and neural substrate deploying a Flanker task and structural magnetic resonance imaging. First, higher L2 proficiency predicted better executive performance. Second, neuroimaging results indicated that bilingualism-related neuroplasticity may peak at a certain stage of bilingual experience and eventually revert, possibly following functional specialization. Importantly, experienced bilinguals optimized behavioral performance independently of volumetric variations, suggesting a degree of performance gain even with lower GMV. Hence, the effects of bilingualism on cognition may evolve with experience, with improvements in functional efficiency eventually replacing structural changes. We conclude that individual differences in bilingual experience modulate cognitive and neural consequences of bilingualism.

OriginalsprogEngelsk
TidsskriftBilingualism
Vol/bind24
Nummer2
Sider (fra-til)293-304
Antal sider12
ISSN1366-7289
DOI
StatusUdgivet - mar. 2021

Bibliografisk note

Publisher Copyright:
Copyright © The Author(s), 2020. Published by Cambridge University Press.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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