Is children's speech development changing? Preliminary evidence from Australian English-speaking 3-year-olds

Area of Science:

• Linguistics
• Developmental Psychology
• Speech-Language Pathology

Background:

• Approximately 9% of children experience difficulties with intelligible speech acquisition despite typical development.
• Speech-language pathologists (SLPs) use speech error descriptions to diagnose speech sound disorder (SSD) and plan interventions.
• Current normative data for speech development require re-evaluation due to population and environmental changes.

Purpose of the Study:

• To assess if established developmental phonological patterns predict speech errors in a recent cohort of preschool children.
• To compare current speech development norms with historical data.

Main Methods:

• 99 neurotypical children aged 3 to 3 years and 8 months were evaluated in 2015.
• The Diagnostic Evaluation of Articulation and Phonology (DEAP) was used for assessment.
• Performance was compared against existing literature on children's speech development.

Main Results:

• Significant differences were observed in phonological pattern usage compared to previous norms.
• Suppression of key phonological patterns (stopping of fricatives, final consonant deletion, voicing contrasts) was delayed.
• Atypical consonant cluster reduction occurred in 10% of children, a potential marker for SSD.

Conclusions:

• Qualitative differences exist in current preschool children's speech development compared to established norms.
• Accurate identification of children requiring intervention necessitates valid and current normative data.
• Regular updates of assessment tools and understanding evolving language learning environments are crucial for speech development research.