Cognitive Processes Related to Memory Capacity Explain Nearly All of the Variance in Language Test Performance in...

Area of Science:

• Cognitive Psychology
• Developmental Psychology
• Linguistics

Background:

• Understanding the cognitive underpinnings of language ability is crucial for identifying and supporting children with developmental language disorder (DLD).
• Previous research suggests a link between cognitive processes and language skills, but the specific dimensionality and strength of these relationships require further investigation, particularly in school-aged children.
• Differentiating cognitive profiles in typically developing (TD) children and those with DLD can inform targeted interventions.

Purpose of the Study:

• To investigate the dimensional structure of cognitive processes, specifically memory capacity and language ability, in children.
• To quantify the relationships among these cognitive and language processes in both TD children and children with DLD.
• To compare the strength of these relationships between the TD and DLD groups.

Main Methods:

• Utilized confirmatory factor analysis (CFA) and structural regression on data from 234 children (117 TD, 117 DLD), propensity matched on key demographic variables.
• Developed latent variables from cognitive processing tasks and standardized language measures (lexical and sentential comprehension/production).
• Tested a five-factor CFA model encompassing Fluid Intelligence, Controlled Attention, Working Memory, Long-Term Memory for Language Knowledge, and Language Ability.

Main Results:

• A five-factor CFA model demonstrated a superior fit, indicating distinct yet related cognitive constructs.
• The four cognitive abilities collectively explained over 92% of the variance in language measures.
• Structural regression revealed a significantly stronger relationship between working memory and language ability in the TD group compared to the DLD group.

Conclusions:

• Cognitive abilities, including fluid intelligence, attention, and memory, are fundamental to language ability in school-aged children.
• The differential strength of the working memory-language relationship highlights a potential key difference in language processing between TD children and those with DLD.
• These findings support a dynamic systems view of language development, where cognitive factors play a dominant role in linguistic outcomes.