Is There a Relationship between Language Switching and Executive Functions in Bilingualism? Introducing a within group Analysis Approach

Soveri, Anna; Rodriguez-Fornells, Antoni; Laine, Matti · 2011 · Crossref

DOI: 10.3389/fpsyg.2011.00183

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Summary

This study investigates the relationship between everyday language switching and executive functions in bilinguals, addressing the controversy surrounding the "bilingual advantage." Previous research relying on between-group comparisons of monolinguals and bilinguals has yielded inconsistent results due to confounding variables inherent in natural group designs. To overcome this, the authors introduce a within-group analysis approach, hypothesizing that individual differences in executive performance among bilinguals are driven by the frequency and nature of their language switching experiences. The researchers employed multiple regression analyses on a sample of 38 Finnish–Swedish early simultaneous bilinguals aged 30 to 75. Participants completed three executive function tasks: the Simon and Flanker tasks (measuring inhibition), a spatial N-back task (measuring working memory updating), and a Number–letter task (measuring set shifting). Language switching behavior was assessed using the Bilingual Switching Questionnaire (BSWQ), which measured tendencies to switch languages, contextual switches, and unintended switches. Additional predictors included age, age of second language acquisition, and the balance of everyday language use. The study examined whether these background factors predicted processing costs in reaction times and error rates. The results revealed that the most consistent effects were found in the set shifting task. Specifically, a higher frequency of everyday language switches significantly predicted a smaller mixing cost in errors, explaining 42% of the variance. Mixing cost reflects the top-down management of competing task sets, which parallels the cognitive demands of selecting the appropriate language in conversation. In contrast, the regression models for inhibition (Simon and Flanker tasks) and updating (N-back task) showed weaker or non-significant relationships with language switching frequency. For instance, while age of L2 acquisition predicted the Simon effect in reaction times, the BSWQ measures did not significantly predict inhibition or updating costs. Age itself was a significant predictor for updating and mixing costs, with younger participants showing better performance. These findings provide support for the theory that bilingual executive advantages stem from lifelong practice in managing two languages, particularly in tasks requiring flexible set shifting. More importantly, the study demonstrates the utility of a within-group analysis approach. By correlating specific bilingual experiences with executive performance, this method avoids the confounds of between-group designs and offers a more nuanced understanding of how language switching shapes cognitive control. The results suggest that the cognitive benefits of bilingualism are not uniform across all executive functions but are specifically linked to the demands of maintaining and switching between active task sets.

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• task switching