Bilingualism and Cognition: A Contested Literature

The bilingual cognitive advantage is one of the more instructive examples of a popular finding meeting rigorous re-examination.

The original claim

Research reported that bilingual speakers outperformed monolinguals on executive function tasks, particularly those involving conflict resolution and inhibition. The proposed mechanism was that constantly managing two active language systems, suppressing one while using the other, trains inhibitory control which then transfers to non-linguistic tasks. It was an appealing and mechanistically plausible story.

The replication problems

Subsequent work has complicated it considerably. Larger studies have often failed to find the advantage. Analyses have found evidence of publication bias, with positive findings more likely to be published. Confounding is a serious issue, since bilingualism correlates with immigration status, socioeconomic factors, education and cultural variables that independently affect the outcome measures. The current state is genuine disagreement among researchers rather than a settled advantage.

What remains defensible

Evidence for a protective association with later dementia onset in bilinguals has been reported in several studies, though it too has confounding concerns and is not universally replicated. More securely: language learning is cognitively demanding, sustained, socially useful and intrinsically rewarding for many people. Those are good reasons to do it. Whether it makes you better at unrelated executive function tasks is a different and much less certain claim.

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