Subject case marking and verb morphology in normally developing and specifically language-impaired children

Area of Science:

• Linguistics
• Developmental Psychology
• Speech-Language Pathology

Background:

• Language development theories suggest a link between verb morphology and subject case pronoun use in children.
• Children with specific language impairment (SLI) exhibit significant challenges with verb morphology and may also show pronoun case errors.
• Investigating these linguistic features may reveal a common underlying cause for SLI-related difficulties.

Purpose of the Study:

• To compare subject case marking and verb morphology use in children with SLI versus typically developing children.
• To examine the relationship between subject case marking and verb morphology in normally developing children.
• To determine if this relationship is present in children with SLI despite their limitations.

Main Methods:

• Comparative analysis of spontaneous speech samples.
• Matching of specifically language-impaired (SLI) children with normally developing (ND) children based on mean utterance length.
• Linguistic analysis focusing on verb morphology and subject case pronoun production.

Main Results:

• Children with SLI demonstrated more limited use of both subject case marking and verb morphology compared to ND children.
• A significant relationship between the use of subject case marking and verb morphology was observed in normally developing children.
• This relationship was also evident in the SLI group, indicating a potential shared developmental pathway.

Conclusions:

• The findings support a connection between verb morphology and subject case marking in child language acquisition.
• Specifically language impairment (SLI) involves deficits in both areas, suggesting a common underlying issue.
• The study highlights the importance of examining multiple linguistic features to understand SLI.