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An effect of bilingualism on the auditory cortex
Ressel, Volker; Pallier, Christophe; Ventura Campos, Noelia. - : Society for Neuroscience, 2013
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An Effect of Bilingualism on the Auditory Cortex
Ressel, Volker; Pallier, Christophe; Ventura-Campos, Noelia. - : Society for Neuroscience, 2012
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An Effect of bilingualism on the auditory cortex
Abstract: Two studies (Golestani et al., 2007; Wong et al., 2008) have reported a positive correlation between the ability to perceive foreign speech sounds and the volume of Heschl's gyrus (HG), the structure that houses the auditory cortex. More precisely, participants with larger left Heschl's gyri learned consonantal or tonal contrasts faster than those with smaller HG. These studies leave open the question of the impact of experience on HG volumes. In the current research, we investigated the effect of early language exposure on Heschl's gyrus by comparing Spanish–Catalan bilinguals who have been exposed to two languages since childhood, to a group of Spanish monolinguals matched in education, socio-economic status, and musical experience. Manual volumetric measurements of HG revealed that bilinguals have, on average, larger Heschl's gyri than monolinguals. This was corroborated, for the left Heschl's gyrus, by a voxel-based morphometry analysis showing larger gray matter volumes in bilinguals than in monolinguals. Since the bilinguals in this study were not a self-selected group, this observation provides a clear demonstration that learning a second language is a causal factor in the increased size of the auditory cortex. ; This work was supported by grants from the Spanish Ministerio de Ciencia e Innovación (JCI-2009-04492, PSI2010-20168; SEJ2009-09072, Consolider-Ingenio2010-CDS-2007-00012), the Catalan Government (SGR 2009-1521), and the French National Agency for Research (ANR 2010 BLAN 1403 01). N.S.-G. received the prize ICREA Acadèmia for excellence in research, funded by the Generalitat de Catalunya. We thank Kimberly Brink for the English correction of the manuscript.
URL: https://doi.org/10.1523/JNEUROSCI.1996-12.2012
http://hdl.handle.net/10230/41824
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