There has been a lot of debate over bilingualism in education. I have read a bit on the website of the National Association for Bilingual Education and some other links to read about bilingualism. However being an amateur in this field, I'd like to know what are the major works (if not conclusive) that support and dissuade against bilingualism in education especially in the context of cognitive science?
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This is a phenomenom I was able to witness first hand when I used to work in an International School, where every student had to learn Japanese and English, as well as having their mother-tongue (some had several more languages as well).
In the paper "Bilingualism and cognitive development in relation to threshold theory" (Ricciardelli, 1992), it is stated that:
Further, in "A Systematic Review and Meta-Analysis of the Cognitive Correlates of Bilingualism" (Adesope, 2010), some links between bilingualism and some increased cognitive abilities have been suggested from research. From their abstract:
A link between bilingualism and how the bilingual student would tackle worded maths problems, in Cognitive Benefits and Costs of Bilingualism in Elementary School Students: The Case of Mathematical Word Problems (Kempert et al. 2011).
An important point
However, there are potential cognitive costs in transferring knowledge from one language to another.
I hope this helps
Some cognitive scientists I heard are clear about benefits of being bilingual as exposed by @Damien or here - http://www.nytimes.com/2011/05/31/science/31conversation.html?_r=0. They also do not hide the associated cognitive costs especially at a young age. I found the following presentation very interesting http://bilingualism.bangor.ac.uk/seminars/documents/AlbertCosta_000.pdf (!! one image af a brain may be disturbing !!).
Hellen Bialystock is a world class researcher in Toronto (more than 100 different languages here, a unique place to work on bilangualism she says). Alert Costa works in Barcelona on Catalan/Spanish - these two researchers are part of my trusted sources of information to understand my bilingual kids!