Balanced bilingualism and early age of second language acquisition as the underlying mechanisms of a bilingual executive control advantage: why variations in bilingual experiences matter

Yow, W. Quin; Li, Xiaoqian · 2015 · OpenAlex-citations

DOI: 10.3389/fpsyg.2015.00164

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Summary

This study investigates the inconsistent evidence regarding the bilingual advantage in executive control by examining how specific variations in bilingual experience influence cognitive performance. Previous research often treated bilingualism as a binary category, ignoring the heterogeneity of language exposure. The authors hypothesize that the cognitive benefits of bilingualism stem from the frequent practice of monitoring and controlling attention between two language systems. Consequently, they test whether balanced bilingualism (equal proficiency and usage of both languages) and an early age of second language acquisition (L2 AoA) serve as underlying mechanisms for enhanced executive functioning in young adults. The researchers recruited 72 English–Mandarin bilingual young adults (aged 18–25) from Singapore, a population controlled for nationality, ethnicity, and education level to minimize demographic confounds. Participants completed a comprehensive battery of four computerized executive function tasks: the Stroop task (measuring prepotent response inhibition), the Eriksen flanker task (measuring resistance to distractor interference), the number–letter switching task (measuring mental-set shifting), and the n-back task (measuring information updating and monitoring). Language background measures, including self-rated proficiency, frequency of use, and age of acquisition, were collected via questionnaire. Statistical analyses included multiple regression, structural equation modeling, and bootstrapping to determine the effects of these continuous bilingual variables on task performance. The results revealed that an earlier age of L2 acquisition was positively associated with lower interference costs in the Stroop task, indicating better inhibitory control. Crucially, balanced bilingualism significantly predicted better performance in the Stroop task and the mixing cost component of the number–letter switching task. Specifically, participants with more balanced usage and proficiency levels in English and Mandarin demonstrated superior executive control skills in these domains. However, no significant effects of bilingualism were found for the flanker or n-back tasks. These findings suggest that the bilingual advantage is not function-general but is specific to certain executive components, particularly those involving inhibition and global set-shifting. The study concludes that variations in bilingual experience are critical to understanding the bilingual cognitive advantage hypothesis. The data support the mechanism that regular, extensive practice in controlling attention to two language systems enhances specific executive control skills, such as inhibiting prepotent responses and shifting mental sets. By treating bilingualism as a continuous variable rather than a discrete category, the research clarifies that the cognitive benefits are contingent upon the degree of balanced language use and early acquisition, offering a more nuanced explanation for the inconsistent findings in prior literature.

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• executive function