Sequencing Deficits and Phonological Speech Errors, But Not Articulation Errors, Predict Later Literacy Skills

Area of Science:

• Child language and literacy development
• Speech-language pathology
• Educational psychology

Background:

• Speech sound disorder (SSD) often co-occurs with language disorders, impacting literacy acquisition.
• Previous research has not differentiated the impact of specific speech error types on literacy outcomes.
• Understanding these relationships is crucial for early intervention and educational support.

Purpose of the Study:

• To investigate the differential relationships between articulation, phonological, and sequencing errors in children aged 5-6 years and their subsequent literacy skills at ages 7-9 years.
• To determine if phonological errors predict phonological awareness (PA) and literacy, controlling for other speech error types and language skills.
• To identify which specific speech error types are most strongly associated with literacy development.

Main Methods:

• A longitudinal study involving 123 children (86 with a history of speech impairment) assessed at ages 5-6 and 7-9 years.
• Analysis of speech production to identify articulation errors, phonological errors, and sequencing deficits.
• Assessment of concurrent language and preliteracy skills, and later literacy outcomes.

Main Results:

• Phonological errors at ages 5-6 years predicted concurrent phonological awareness and letter knowledge, as well as later literacy skills, independent of language ability.
• Sequencing deficits demonstrated the strongest association with both phonological awareness (ages 5-6) and literacy outcomes (ages 7-9).
• Articulation errors did not significantly predict literacy skills.

Conclusions:

• Specific components of speech sound disorder uniquely predict preliteracy and literacy skills, even when language ability is controlled.
• Sequencing deficits represent a critical area for further research regarding their strong link to literacy.
• Findings support the potential benefit of integrating literacy interventions into speech therapy to mitigate future reading difficulties.