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Examining Bilingual Language Control Using the Stroop Task
Published on: February 26, 2020
Structural neural predictors of Farsi-English bilingualism
Visar Berisha1, Davis Gilton2, Leslie C Baxter3
1Department of Speech and Hearing Science, Arizona State University, Tempe, AZ 85287, USA; School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287, USA.
Abstract:
The neurobiology of bilingualism is hotly debated. The present study examines whether normalized cortical measurements can be used to reliably classify monolinguals versus bilinguals in a structural MRI dataset of Farsi-English bilinguals and English monolinguals. A decision tree classifier classified bilinguals with an average correct classification rate of 85%, and monolinguals with a rate of 71.4%. The most relevant regions for classification were the right supramarginal gyrus, left inferior temporal gyrus and left inferior frontal gyrus. Larger studies with carefully matched monolingual and bilingual samples are needed to confirm that features of these regions can reliably categorize monolingual and bilingual brains. Nonetheless, the present findings suggest that a single structural MRI scan, analyzed with measures readily available using default procedures in a free open-access software (Freesurfer), can be used to reliably predict an individual's language experience using a decision tree classifier, and that Farsi-English bilingualism implicates regions identified in previous group-level studies of bilingualism in other languages.
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