Early grammatical development in Spanish children with Down syndrome

Area of Science:

• Developmental Psychology
• Linguistics
• Genetics

Background:

• Down syndrome (DS) is a genetic disorder associated with cognitive and developmental delays.
• Morphosyntactic development is a key indicator of language acquisition in early childhood.
• Understanding language development in children with DS is crucial for targeted interventions.

Purpose of the Study:

• To analyze and compare morphosyntactic development between children with Down syndrome (DS) and typically developing (TD) children.
• To investigate the impact of mental age and vocabulary size on morphosyntactic complexity in both groups.
• To identify specific differences in utterance length, complexity, and morphological suffix use.

Main Methods:

• A comparative study involving 92 children with DS and 92 TD children, matched for mental age (20-29 months) and gender.
• A second analysis matched participants based on vocabulary size.
• Morphosyntactic information was gathered using an adapted Communicative Development Inventory (CDI) for children with DS.

Main Results:

• Children with DS produced significantly shorter utterances and exhibited less morphosyntactic complexity and fewer morphological suffixes compared to TD peers, despite equivalent mental age.
• While the developmental pattern was similar, children with DS demonstrated a slower progression.
• Performance in morphosyntactic complexity and suffix use was consistently lower in the DS group across both matching analyses.

Conclusions:

• Children with Down syndrome experience delays in morphosyntactic development relative to their typically developing peers.
• These delays persist even when controlling for mental age and vocabulary size, suggesting unique linguistic challenges.
• Findings highlight the need for tailored language support strategies for children with DS.