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Proportion and Profile of Autistic Children Not Acquiring Spoken Language Despite Receiving Evidence-Based Early

Giacomo Vivanti¹, Michael V Lombardo², Ashley Zitter³

¹A.J. Drexel Autism Institute, Drexel University.

Journal of Clinical Child and Adolescent Psychology : the Official Journal for the Society of Clinical Child and Adolescent Psychology, American Psychological Association, Division 53

|November 20, 2025

Summary

About one-third of autistic preschoolers with limited spoken language did not improve after interventions. Early motor imitation skills and intervention duration influenced spoken language development in children with autism spectrum disorder.

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Area of Science:

Developmental Psychology
Speech-Language Pathology
Autism Spectrum Disorder Research

Background:

Autism spectrum disorder (ASD) often impacts spoken language development.
Evidence-supported interventions aim to improve spoken language in preschoolers with ASD.
Understanding factors influencing language acquisition is crucial for targeted support.

Purpose of the Study:

To determine the proportion of preschoolers with ASD who do not acquire spoken language despite interventions.
To identify characteristics (profiles) of non-speaking children with ASD who do not progress.
To analyze factors associated with spoken language development in this population.

Main Methods:

Examined an aggregate dataset of 707 preschoolers with ASD receiving interventions.
Interventions ranged from 6 to 24 months, delivered in university-affiliated programs.
Spoken language outcomes assessed via parent-report, validated by direct assessments and natural language samples.

Main Results:

Two-thirds of non-speaking children achieved single words or more complex language post-intervention.
Children remaining non-speaking had lower baseline motor imitation scores.
Half of minimally speaking children combined words by intervention exit; those who didn't had lower cognitive, social, adaptive, and motor scores, and shorter intervention duration.

Conclusions:

Approximately one-third of children with limited/no baseline spoken language did not advance linguistically.
Spoken language development was linked to modifiable child and intervention factors.
Intervention type did not significantly affect spoken language acquisition odds.