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The age of second language acquisition determines the variability in activation elicited by narration in three languages in Broca's and Wernicke's area

Bloch, Constantine and Kaiser, Anelis and Kuenzli, Esther and Zappatore, Daniela and Haller, Sven and Franceschini, Rita and Luedi, Georges and Radue, Ernst-Wilhelm and Nitsch, Cordula. (2009) The age of second language acquisition determines the variability in activation elicited by narration in three languages in Broca's and Wernicke's area. Neuropsychologia, Vol. 47, H. 3. pp. 625-633.

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Official URL: http://edoc.unibas.ch/dok/A5252469

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Abstract

It is generally accepted that the presence of a second language (L2) has an impact on the neuronal substrates build up and used for language processing; the influence of the age of L2 exposure, however, is not established. We tested the hypothesis that the age of L2 acquisition has an effect on the cortical representation of a multilingual repertoire in 44 multilinguals with different age of exposure to a L2 (simultaneous or covert simultaneous exposure to L1 and L2, sequential acquisition of L1 and L2 between 1 and 5 years, late learning of L2 after 9 years of age) and all fluent in a late learned L3. Regional activation in a language production task showed a high in-between-subject variability, which was higher than within-subject variability between L1, L2, and L3. We, therefore, performed a single subject analysis and calculated the within-subject variance in the numbers of activated voxels in Broca's and Wernicke's area. Subjects with early exposure to L2 showed low variability in brain activation in all three languages, in the two early as well as the late learned language. In contrast, late multilinguals exhibited higher variability. Thus, cerebral representation of languages is linked to the age of L2 acquisition: early exposure to more than one language gives rise to a language processing network that is activated homogeneously by early and late learned languages, while the inhomogeneous activation in late multilinguals indicates more independent access to the multilingual repertoire. Early passive exposure to L2 results in the same low variance as active bilingual upbringing. Variability in local brain activity increases progressively from the simultaneous to late L2 exposure, indicating a gradual transition from the mode of early bilingual language representation to that of late ones.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Division of Anatomy > Cell Adhesion (Spindler)
04 Faculty of Humanities and Social Sciences > Departement Sprach- und Literaturwissenschaften > Ehemalige Einheiten Sprach- und Literaturwissenschaften > Französische Linguistik (Lüdi)
UniBasel Contributors:Lüdi, Georges and Nitsch, Cordula
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Pergamon
ISSN:0028-3932
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:04
Deposited On:22 Mar 2012 13:46

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