Abstract

The relationship between executive function and second-language ability remains contentious in bilingual children; thus, the current study focused on this issue. In total, 371 Uyghur-Chinese bilingual children ranging from 3 to 6years old were assessed by a battery of tasks measuring language ability (expressive vocabulary tests, receptive vocabulary tests, and phonological awareness of both their first-language and second-language) and executive function (working memory, inhibition, and switching). Our results indicated that age is a crucial moderator of the relationship between second-language ability and executive function. Specifically, executive function unilaterally predicted second-language ability in children who were 3-4 years old, whereas second-language ability and executive function bilaterally influenced each other in children who were 4-5 and 5-6 years old. These findings suggest that executive function and second-language ability have an intertwined and causal relationship among preschool children during development. The theoretical implications of these findings are discussed. RESEARCH HIGHLIGHTS: A counterfactual model showed causality between executive function and second language ability in Uyghur-Chinese bilingual children. Executive function unilaterally predicted second language ability in the 3- to 4-year-old age group. Executive function and second language ability bilaterally influenced each other in the 4- to 5 and 5- to 6-year-old age groups.

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