Reading
Why do bilingual kids lag in reading comprehension?
Open access · cc by · source: Europe PMC
Bilingual children read words as fast as monolinguals but understand texts less well, mainly because their vocabulary in the school language is smaller, and the same skills drive comprehension in both groups.
Study at a glance
- Design
- Cross-sectional — Single-time-point testing of Dutch fourth graders with multigroup path analysis comparing first-language (L1) and second-language (L2) readers
- N
- N=178 · 178 fourth graders (102 bilingual); first-language vocabulary available for a subgroup of 56 bilingual children
- Population
- Fourth-grade children in ten classrooms across seven schools in cities in the south of the Netherlands, monolingual Dutch and bilingual (mainly Turkish, Moroccan Arabic, Berber)
- Outcome
- Dutch reading comprehension (cloze text task), with vocabulary, decoding, syntactic integration, working memory and inhibition as predictors
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
Bilingual children decoded faster than monolinguals but scored lower on Dutch vocabulary, grammar judgement and reading comprehension, with no differences in working memory or inhibition. In both groups, vocabulary and decoding predicted comprehension directly and through syntactic integration, and working memory worked only through syntactic integration; inhibition predicted syntactic integration only for bilinguals, and that group difference was marginal. The model explained 43% of comprehension variance for monolinguals and 51% for bilinguals, and home-language vocabulary added a positive direct effect on Dutch comprehension.
Methodology
The researchers tested 178 Dutch fourth graders, 102 of whom spoke another language at home, on vocabulary, word and pseudoword decoding, grammar judgement (syntactic integration), backward digit span (working memory), a Simon task (inhibition) and a cloze-style reading comprehension test. They used path analysis to see whether lexical quality and executive control predicted comprehension directly and via syntactic integration, and whether these paths differed between monolingual and bilingual readers. For a subgroup of bilingual children they also measured vocabulary in the home language.
Limitations
All measures were taken at one point in time, so the paths are statistical associations, not proof that vocabulary or working memory cause better comprehension; the authors call for longitudinal data. Each construct was measured with only one or two tests, so measurement error was not modelled, and the working-memory test had low reliability. The home-language vocabulary analysis rested on only 56 children, and the inhibition difference between groups was only marginally significant, so both findings need replication. The bilingual children were mostly non-balanced bilinguals from lower-income urban areas, which limits generalisation.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Knowing many words, and knowing them well, goes with understanding texts better even among children who can already decode.
Vocabulary knowledge adds a large share of explained variance in reading comprehension beyond decoding, memory and reasoning: in 292 Dutch fourth graders the vocabulary measures added about 30% (65% total explained), with written vocabulary breadth carrying the most unique variance (8%).
Evidence for the claim as stated.
General cognitive skills help comprehension by supporting the core language and decoding skills.
Working memory and attention seem to reach reading comprehension indirectly, through word reading, listening comprehension or sentence-level (syntactic) integration, rather than directly.
Evidence for the claim as stated.
History
When this study was placed
Dated entries from the concept change log — when this paper was added or removed as support, challenge, or qualifier on a claim.
Placed as supporting evidence on Literacy Instruction
Vocabulary knowledge adds a large share of explained variance in reading comprehension beyond decoding, memory and reasoning: in 292 Dutch fourth graders the vocabulary measures added about 30% (65% total explained), with written vocabulary breadth carrying the most unique variance (8%).
Placed as supporting evidence on Literacy Instruction
Working memory and attention seem to reach reading comprehension indirectly, through word reading, listening comprehension or sentence-level (syntactic) integration, rather than directly.
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