Examining Potential Mediators of the Relationship Between Developmental Language Disorder and Executive Function...

Area of Science:

• Developmental Psychology
• Neuroscience
• Linguistics

Background:

• Developmental Language Disorder (DLD) impacts language acquisition.
• Executive functions are crucial for cognitive control and daily functioning.
• The relationship between DLD and executive function deficits is complex and requires further investigation.

Purpose of the Study:

• To investigate potential mediators linking developmental language disorder (DLD) status to executive function performance in preschoolers.
• To determine if nonverbal IQ and receptive vocabulary explain the executive function differences observed in children with DLD.

Main Methods:

• Preschoolers (80 with DLD, 103 typical language) were assessed.
• Standardized tests measured nonverbal IQ and receptive vocabulary.
• Executive function was evaluated using the Dimensional Change Card Sort; socioeconomic status (SES) was measured via maternal education.

Main Results:

• Children with DLD exhibited lower language, nonverbal IQ, executive function, and SES compared to peers.
• Nonverbal IQ and receptive vocabulary partially mediated the DLD-executive function relationship.
• A significant direct effect of DLD status on executive function remained after accounting for mediators.

Conclusions:

• Differences in nonverbal IQ and receptive vocabulary partially explain lower executive function in children with DLD.
• A substantial direct effect of DLD on executive function suggests other underlying factors contribute to these deficits.