# Early Perception of Intonation in Down Syndrome: Implications for Language Intervention

## TL;DR

This study shows that infants with Down Syndrome can initially perceive intonation but lose this ability later, suggesting early language interventions using intonation could be beneficial.

## Contribution

The study identifies a critical developmental window for intonation perception in infants with Down Syndrome, informing early language intervention strategies.

## Key findings

- Infants with Down Syndrome initially discriminate statement and question intonation like typically developing infants.
- Older infants with Down Syndrome lose the ability to discriminate intonation contrasts.
- Early intervention using intonation is crucial for language development in infants with Down Syndrome.

## Abstract

Language difficulties have been highlighted as a cornerstone of the developmental profile in Down Syndrome (DS), but very few studies have examined early language abilities in children with DS to determine the initial strengths and weaknesses that might inform early language interventions to support language development in this population. This study focused on the early perception of intonation and examined whether it differed between infants with DS and typically developing (TD) peers. Using a visual habituation paradigm from a previous study on TD infants’ ability to perceive the intonation of statements and questions, infants with DS were able to successfully discriminate statement and question intonation, similarly to TD infants. However, unlike for TD infants, an age group effect was found, with older infants with DS being unable to discriminate the intonation contrast. Our findings highlight the importance of prosody in early development also in infants with DS. Moreover, the unexpected decrease in early sensitivity to intonation in older infants with DS pinpoints a crucial developmental window—the first semester of life—for early interventions using intonation to support language learning in these infants.