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Over the last decade, research on multilingualism has grown and has provided researchers with new insights into the mechanisms at work in the multilingual brain. While some studies of multilinguals have shown similar results to what has been seen in studies of bilinguals, certain unique properties of multilinguals are beginning to be noticed, particularly regarding early language representation, gray matter density, and speed of lexical retrieval. In addition, research on cognitive control, language switching, working memory, and certain consequences of multilingualism (advantages and disadvantages) are reviewed in terms of their effects on the brains of bilinguals and multilinguals. Although there is little agreement among papers concerning specific regions that are structurally different in monolinguals and multilinguals, publications do show differences. Similarly, there are studies reporting somewhat different regions called upon for processing a given language in multilinguals compared to monolinguals.
Higby et al. (Fri,) studied this question.