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In page Ellen Bialystok:

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Bilingualism has been shown through various studies to have a significant effect on certain aspects of cognitive development, especially in comparison to that of monolingual individuals.[1] Bialystok has investigated this idea further, attempting to figure out what parts of cognitive development, specifically, are affected by bilingualism. Children are of particular interest to this realm of research, as she studies the developmental progression of bilingual children as opposed to that of monolingual children.