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Bilingual speakers constantly select some features from their linguistic repertoire and inhibit others, relying on what psycholinguists call the executive function of the brain. Bialystok and her colleagues, who study how bilingualism affects the mind and brain, have used behavioral and neuroimaging methods to show that bilinguals, because of their constant use of two languages, perform better on executive control tasks than do monolinguals (Barac & Bialystok, 2012; Bialystok, 2011, 2015, 2016; Kroll & Bialystok, 2013).
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Ofelia García (Educating Emergent Bilinguals: Policies, Programs, and Practices for English Learners (Language and Literacy Series))