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The bilingual structural connectome: Dual-language experiential factors modulate distinct cerebral networks

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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  • Davide Fedeli
  • Nicola Del Maschio
  • Simone Sulpizio
  • Jason Rothman
  • Jubin Abutalebi
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Article number104978
<mark>Journal publication date</mark>30/09/2021
<mark>Journal</mark>Brain and Language
Volume220
Publication StatusPublished
Early online date23/06/21
<mark>Original language</mark>English

Abstract

Bilingualism is a natural laboratory for studying whether the brain's structural connectome is influenced by different aspects of language experience. However, evidence on how distinct components of bilingual experience may contribute to structural brain adaptations is mixed. The lack of consistency, however, may depend, at least in part, on methodological choices in data acquisition and processing. Herein, we adopted the Network Neuroscience framework to investigate how individual differences in second language (L2) exposure, proficiency, and age of acquisition (AoA) – measured as continuous between-subject variables – relate to whole-brain structural organization. We observed that L2 exposure modulated the connectivity of two networks of regions subserving language comprehension and production. L2 proficiency was associated with enhanced connectivity within a rostro-caudal network, which supports language selection and word learning. Moreover, L2 AoA and exposure affected inter-hemispheric communication between control-related regions. These findings expand mechanistic knowledge about particular environmental factors associated with specific variation in brain structure.

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