Domain-general and language-specific contributions to speech production in L2: an fMRI study using functional localizers.
Update: 2023-07-03
Description
Link to bioRxiv paper:
http://biorxiv.org/cgi/content/short/2023.07.02.547419v1?rss=1
Authors: Wolna, A., Szewczyk, J., Diaz, M., Domagalik, A., Szwed, M., Wodniecka, Z.
Abstract:
For bilinguals, speaking in a second language (L2) compared to the native language (L1) is usually more difficult. In this study we asked whether the difficulty in L2 production reflects increased demands imposed on domain-general or core language mechanisms. We compared the brain response to speech production in L1 and L2 within two functionally-defined networks in the brain: the Multiple Demand (MD) network and the Language network. We found that speech production in L2 was linked to a widespread increase of brain activity in the domain-general MD network. The Language network did not show a similarly robust differences in processing speech in the two languages, however, we found increased response to L2 production in the language-specific portion of the left IFG. To further explore our results, we have looked at domain-general and language-specific response within the brain structures postulated to form a Bilingual Language Control network. Within this network, we found a robust increase in response to L2 in the domain-general, but also in some language-specific voxels including in the left IFG. Our findings show that L2 production strongly engages domain-general mechanisms, but only locally affects language-specific processing. These results put constrain on the current model of bilingual language control.
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http://biorxiv.org/cgi/content/short/2023.07.02.547419v1?rss=1
Authors: Wolna, A., Szewczyk, J., Diaz, M., Domagalik, A., Szwed, M., Wodniecka, Z.
Abstract:
For bilinguals, speaking in a second language (L2) compared to the native language (L1) is usually more difficult. In this study we asked whether the difficulty in L2 production reflects increased demands imposed on domain-general or core language mechanisms. We compared the brain response to speech production in L1 and L2 within two functionally-defined networks in the brain: the Multiple Demand (MD) network and the Language network. We found that speech production in L2 was linked to a widespread increase of brain activity in the domain-general MD network. The Language network did not show a similarly robust differences in processing speech in the two languages, however, we found increased response to L2 production in the language-specific portion of the left IFG. To further explore our results, we have looked at domain-general and language-specific response within the brain structures postulated to form a Bilingual Language Control network. Within this network, we found a robust increase in response to L2 in the domain-general, but also in some language-specific voxels including in the left IFG. Our findings show that L2 production strongly engages domain-general mechanisms, but only locally affects language-specific processing. These results put constrain on the current model of bilingual language control.
Copy rights belong to original authors. Visit the link for more info
Podcast created by Paper Player, LLC
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