The effect of bilingualism on the cognitive skills of young children was investigated by comparing performance of 162 children who belonged to one of two age groups (approximately 3-and 4½-year-olds) and one of three language groups on a series of tasks examining executive control and word mapping. The children were monolingual English speakers, monolingual French speakers, or bilinguals who spoke English and one of a large number of other languages. Monolinguals obtained higher scores than bilinguals on a receptive vocabulary test and were more likely to demonstrate the mutual exclusivity constraint, especially at the younger ages. However, bilinguals obtained higher scores than both groups of monolinguals on three tests of executive functioning: Luria's tapping task measuring response inhibition, the Opposite Worlds task requiring children to assign incongruent labels to a sequence of animal pictures, and reverse categorization in which children needed to reclassify a set of objects into incongruent categories after an initial classification. There were no differences between the groups in the ANT flanker task requiring executive control to ignore a misleading cue. This evidence for a bilingual advantage in aspects of executive functioning at an earlier age than previously reported is discussed in terms of the possibility that bilingual language production may not be the only source of these developmental effects.One of the most crucial cognitive developments in early childhood is the emergence of the executive function system (Diamond, 2002). These executive processes are the basis for all higher thought, including control of attention (needed for selection and inhibition of the variety of environmental cues), working memory (needed for planning and maintaining set), and switching (needed for multitasking). Research with preschool children has shown that bilingual children develop control over these executive processes earlier than monolingual children (Bialystok, 2001). Importantly, these bilingual advantages are found not only on verbal tasks where executive control to resolve conflict between form and meaning gives bilinguals an advantage on metalinguistic tasks (Bialystok, 1988;Cromdal, 1999;Galambos & Goldin-Meadow, 1990) but also on nonverbal tasks where no explicit linguistic processing is involved (reviewed below).Correspondence should be sent to Ellen Bialystok, Department of Psychology, York University, 4700 Keele Street, Toronto, Ontario, M5R 3A8, Canada. ellenb@yorku.ca.
NIH Public AccessAuthor Manuscript J Cogn Dev. Author manuscript; available in PMC 2011 October 1.
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NIH-PA Author ManuscriptThe basis for the bilingual advantage is commonly assumed to be in the constant need for bilinguals to control attention to two language systems, a process that boosts those attentional processes for all tasks including nonverbal ones. But how much experience in attending to two languages is necessary for these generalized effects to appear? If these ad...