Intervention focus moderates the association between initial receptive language and language outcomes for toddlers...

Area of Science:

• Developmental Psychology
• Speech-Language Pathology
• Augmentative and Alternative Communication (AAC)

Background:

• Children with developmental delay often experience challenges in receptive and expressive language development.
• Early language intervention is crucial for improving communication outcomes.
• Understanding how different intervention approaches affect language acquisition is essential for clinical practice.

Purpose of the Study:

• To reanalyze existing data and investigate whether the focus of an intervention moderates the relationship between pre-intervention receptive language and post-intervention expressive language measures.
• To compare the effectiveness of augmented communication-input (AC-I), augmented communication-output (AC-O), and spoken communication (SC) interventions on language development in toddlers with developmental delay.

Main Methods:

• An ex-post facto study reanalyzing data from 62 toddlers with developmental delay randomly assigned to AC-I, AC-O, or SC interventions.
• AC-I involved augmented language input via speech-generating device (SGD); AC-O encouraged augmented output via SGD; SC used spoken language without an SGD.
• Standardized measures of receptive and expressive language, along with observations of expressive target vocabulary size, were used.

Main Results:

• Intervention focus moderated the impact of initial receptive language on expressive language age and expressive target vocabulary size.
• Participants in AC-I showed a stronger relationship between initial receptive language and post-intervention expressive language age compared to AC-O and SC groups.
• In the AC-O group, a strong relationship was observed between initial receptive language and expressive target vocabulary size, while a weaker relationship was found in the AC-I group. No significant relationship was found in the SC group.

Conclusions:

• Different intervention approaches yield distinct outcomes for children with varying initial receptive language abilities.
• Augmented communication interventions, particularly AC-I and AC-O, demonstrate differential effects based on a child's baseline receptive language skills.
• Tailoring intervention strategies to individual language profiles may optimize expressive language development in toddlers with developmental delay.