دانلود مقاله ISI انگلیسی شماره 133850
ترجمه فارسی عنوان مقاله

دو زبانه سازی ساختار ماده سفید مسیرهای مرتبط با زبان را مدول می کند

عنوان انگلیسی
Bilingualism modulates the white matter structure of language-related pathways
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
133850 2017 9 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : NeuroImage, Volume 152, 15 May 2017, Pages 249-257

پیش نمایش مقاله
پیش نمایش مقاله  دو زبانه سازی ساختار ماده سفید مسیرهای مرتبط با زبان را مدول می کند

چکیده انگلیسی

Learning and speaking a second language (L2) may result in profound changes in the human brain. Here, we investigated local structural differences along two language-related white matter trajectories, the arcuate fasciculus and the inferior fronto-occipital fasciculus (IFOF), between early simultaneous bilinguals and late sequential bilinguals. We also examined whether early exposure to two languages might lead to a more bilateral structural organization of the arcuate fasciculus. Fractional anisotropy, mean and radial diffusivities (FA, MD, and RD respectively) were extracted to analyse tract-specific changes. Additionally, global voxel-wise effects were investigated with Tract-Based Spatial Statistics (TBSS). We found that relative to late exposure, early exposure to L2 leads to increased FA along a phonology-related segment of the arcuate fasciculus, but induces no modulations along the IFOF, associated to semantic processing. Late sequential bilingualism, however, was associated with decreased MD along the bilateral IFOF. Our results suggest that early vs. late bilingualism may lead to qualitatively different kind of changes in the structural language-related network. Furthermore, we show that early bilingualism contributes to the structural laterality of the arcuate fasciculus, leading to a more bilateral organization of these perisylvian language-related tracts.