Dialogic Reading Boosts Vocabulary and Engagement in Bengali-Speaking Preschoolers

A quiet revolution is taking place in early childhood classrooms across the United States, and it begins with something as simple as an adult and a child reading a picture book together. New research published in the Early Childhood Education Journal suggests that a structured technique known as dialogic reading can meaningfully improve vocabulary, letter knowledge, and classroom engagement among young dual language learners who are at risk of developmental delay. What makes the study remarkable is not just what it found, but who it studied: Bengali-speaking preschoolers, a population almost entirely absent from the American intervention research literature.

Dual language learners, or DLLs, are children who are developing proficiency in two languages simultaneously, typically a home language and English. According to demographic data cited by the researchers, this population in the United States is growing rapidly and becoming increasingly linguistically diverse. Yet the vast majority of intervention studies have focused almost exclusively on Spanish-English bilingual children. That narrow focus has left educators with little rigorous evidence to guide their work with children from other linguistic communities, including the growing number of South Asian language speakers in American preschools.

The research team, led by Ekta Ghosh of the University of Denver together with Rashida Banerjee, Caroline James, and Dina Malala, set out to address this gap directly. Their question was deceptively straightforward: does dialogic reading work for Bengali-speaking preschool DLLs who are at risk of developmental delay? The answer, based on their single-case research design, appears to be a cautious but encouraging yes. Across all three participants, the intervention produced measurable improvements in both English and Bengali vocabulary, in alphabetic knowledge, and in behavioral engagement during literacy activities.

Dialogic reading itself is not a new idea. First developed by researchers Whitehurst and colleagues in the 1990s, the technique transforms shared book reading from a passive experience into an active dialogue. Rather than simply reading the words on the page aloud, the adult prompts the child with questions, expands on the child’s responses, provides feedback, and gradually shifts more of the storytelling responsibility to the child. The method follows a progression from simple completion and recall prompts to open-ended questions and wh-questions, encouraging children to become active narrators of the story rather than passive listeners.

The theoretical appeal of dialogic reading for dual language learners lies in its flexibility. Because the technique relies on conversation rather than scripted instruction, it can be adapted to a child’s existing language resources. Children can respond in either language, and adults can scaffold meaning across both. This aligns with broader theoretical frameworks in bilingual education, including the concept of translanguaging, which treats a child’s full linguistic repertoire as a resource for learning rather than a barrier to it. It also connects to decades of evidence that a strong home language foundation supports, rather than hinders, second language acquisition.

Methodologically, the study employed a single-case research design, an approach well suited to intervention research with small, specific populations. Single-case designs involve repeated, systematic measurement of each participant’s performance during a baseline phase and an intervention phase, allowing researchers to demonstrate experimental control at the level of the individual child. The approach follows established design standards articulated by Kratochwill and colleagues, and it is particularly valuable when random assignment to large treatment and control groups is impractical, as is often the case with linguistically specific populations of young children.

The participants were three Bengali-speaking preschoolers, aged 36 to 60 months, who were developing proficiency in both English and their home language and who had been identified as at risk of developmental delay. The researchers measured a battery of outcomes, including expressive and receptive vocabulary in both languages, lowercase and uppercase letter identification, letter-sound knowledge, and sight word recognition. They also tracked behavioral engagement, observing how actively each child participated in literacy activities. Screening with the Clinical Evaluation of Language Fundamentals, Fifth Edition, helped document the children’s language profiles at the outset.

The results, presented in detailed graphs tracking each child’s performance across baseline and intervention sessions, showed improvements on every outcome measure for every participant. Vocabulary responses increased, letter identification and letter-sound knowledge improved, and the children showed higher levels of positive engagement alongside reductions in off-task and disengaged behaviors during the intervention phase. The engagement findings are particularly noteworthy, because behavioral engagement is both a consequence of effective instruction and a driver of future learning. Children who are absorbed in a book activity practice more language, attend more closely, and build stronger associations with literacy itself.

Why does this matter beyond the classroom? Early language and literacy skills are among the strongest predictors of later academic achievement, and national assessment data have long shown persistent reading performance gaps. Children who enter school with underdeveloped vocabulary and emergent literacy skills face an uphill climb that tends to widen over time. For dual language learners at risk of developmental delay, the stakes are even higher, since early delays can compound across domains. Interventions that are inexpensive, scalable, and adaptable to diverse home languages, as dialogic reading is, therefore carry enormous practical significance for early childhood educators and families alike.

The study also contributes to a growing international evidence base. Recent systematic reviews and meta-analyses have found that shared picture book reading interventions support child language development broadly, and randomized trials in Scandinavia have examined dialogic reading with additional language learners in preschool settings. Other recent work has tested culturally adapted, caregiver-mediated versions of early literacy interventions within community organizations serving Latino families. What the new study adds is evidence from a linguistic community that has been nearly invisible in this literature, extending the reach of the technique beyond the Spanish-English populations that have dominated United States research.

The authors are careful to frame their findings as preliminary. With three participants and a single-case design, the study cannot establish how large the effects are on average or how they generalize to other children and settings. Single-case research answers questions about whether an intervention can work for individuals under specified conditions, not whether it will work everywhere. The researchers themselves describe the results as preliminary evidence supporting culturally responsive early literacy practices for preschool DLLs from underrepresented linguistic communities, a formulation that invites replication rather than claiming definitive proof.

Even so, the implications for practice are concrete. Preschool teachers, paraprofessionals, and families can be trained to implement dialogic reading with relatively modest resources, and prior studies have shown that even paraprofessionals can deliver the technique effectively when properly coached. The key ingredients are prompting, expansion, feedback, and repetition, all delivered within the warmth of a shared reading experience. For educators serving children from South Asian language backgrounds, the study suggests that these techniques can honor the home language while building English skills, rather than forcing a choice between the two.

There is also a broader equity argument embedded in this research. As the United States becomes what demographers have called superdiverse, with young dual language learners speaking an ever-widening array of home languages, intervention research that samples only one or two linguistic groups risks leaving entire communities without evidence-based guidance. Studies like this one, small in scale but methodologically rigorous, begin to correct that imbalance. They demonstrate that the tools of early literacy science can travel across languages and cultures when researchers take the trouble to test them there.

The road ahead involves larger studies, longer follow-up periods to test whether gains persist, and exploration of how dialogic reading interacts with classroom curricula and family practices. But the core message of the study is already resonant: a conversation over a picture book, conducted with intention and skill, can help a bilingual preschooler at risk of delay find their words in two languages. In a field often dominated by debates over technology and curriculum, that is a refreshingly human finding, and one that any parent or teacher can put into practice at bedtime tonight.

Subject of Research: Dialogic reading intervention for Bengali-speaking preschool dual language learners at risk of developmental delay

Article Title: Transforming Language and Literacy: The Impact of Dialogic Reading Intervention on Young Dual Language Learners

Article References: Ghosh, E., Banerjee, R., James, C., & Malala, D. (2026). Transforming Language and Literacy: The Impact of Dialogic Reading Intervention on Young Dual Language Learners. Early Childhood Education Journal. https://doi.org/10.1007/s10643-026-02333-2

Image Credits: AI Generated

DOI: 10.1007/s10643-026-02333-2

Keywords: dual language learners, dialogic reading, early literacy, vocabulary development, Bengali-speaking children, preschool education, single-case design, developmental delay, emergent literacy, culturally responsive practice, behavioral engagement, bilingualism