SLPSystematic ReviewInternational journal of language & communication disorders2025

Examining Neurodiversity in Bilingual Development Research: Recent Insights Through an Equity, Diversity, and Inclusion Lens.

Kai Ian Leung, Monika Molnar

PMID 40709907

WHAT IT FOUND

Most studies of bilingual neurodivergent children used tools made for monolingual children, and many tested only one language.

This can make bilingual abilities look impaired when the problem is the measurement.

Key findings

0182 of 95 studies used single-language study tools, and 86% of studies assessed bilinguals using tools developed for monolingual populations.

0243 of 95 studies tested bilinguals in only one language, and 62% of DLD studies did not conduct all study tasks in both languages.

03None of the included studies used community-based approaches such as co-design or involving bilingual youth as partners.

STILL TO COME

How it was doneWhat they foundWhat it means for SLPs

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What it does not show

Screening and extraction were done by one reviewer, so eligible studies may have been missed or classified differently. The search was limited to English and French publications, which may underrepresent research from other language communities. The participant totals may be inflated because the same children could appear in more than one study. The review describes how research was conducted, not whether bilingualism improves or worsens language or cognition. Longitudinal and retrospective designs were uncommon, so the review does not show development over time. Literacy tasks and diagnostic validation studies were excluded, so it does not address reading, writing, or test accuracy directly.

Declared interests

The authors declared no conflicts of interest.

The easy way to misread this

Do not conclude that a low score on a monolingual test in one language proves a disorder. The review says language diagnoses require impairment in both languages, and many studies tested only one language.

Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →


The study

Participants
95 studies; 5601 bilingual neurodivergent, 7373 monolingual neurodivergent and 2969 bilingual typically developing participants, with possible overlap across studies
Certainty of evidence
Moderate

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Kai Ian Leung, Monika Molnar Examining Neurodiversity in Bilingual Development Research: Recent Insights Through an Equity, Diversity, and Inclusion Lens. International journal of language & communication disorders. 2025.

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