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Augmentative and Alternative Communication Generative Language Intervention: A Randomized Controlled Trial.

Cathy Binger1, Nancy Harrington2, Debbie L Hahs-Vaughn3

  • 1Department of Speech & Hearing Sciences, The University of New Mexico, Albuquerque.

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|June 1, 2026
PubMed
Summary
This summary is machine-generated.

The AAC Generative Language Intervention (AAC-GLI) program significantly improved expressive grammar in preschoolers using augmentative and alternative communication (AAC). This intervention shows promise for enhancing grammatical skills in young children with communication impairments.

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Area of Science:

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

Background:

  • Children with impairments like cerebral palsy benefit from AAC.
  • Current AAC interventions often focus on basic skills, neglecting grammar.
  • Preschoolers with intact receptive language need targeted expressive grammar support.

Purpose of the Study:

  • To evaluate the AAC Generative Language Intervention (AAC-GLI) program.
  • To assess the impact on aided expressive grammar in preschoolers using AAC.
  • To investigate improvements in children with intact receptive language.

Main Methods:

  • Randomized controlled trial with 40 children requiring AAC.
  • Intervention group received 28 play-based AAC-GLI sessions.
  • Weighted mean length of utterance in symbols (W-MLUSym) measured progress.

Main Results:

  • The intervention group showed significantly greater W-MLUSym gains than the control group.
  • Growth modeling confirmed the intervention's positive effect on expressive grammar development.
  • W-MLUSym remained stable in the control group, indicating the intervention's efficacy.

Conclusions:

  • AAC-GLI effectively teaches expressive grammar skills to preschoolers with impairments.
  • Focusing on grammatical growth is crucial for expressive language development in young AAC users.
  • This intervention supports a more comprehensive approach to AAC language development.