Will AAC stop my child from talking?

Will AAC stop my child from talking?

This is one of the most common questions parents bring to us. It's also one of the most thoroughly researched questions in our field. The answer is consistent across two decades of evidence — and it's not the answer many parents have been led to expect.

"If we give them a communication device, will they stop trying to talk?"

We hear it from parents in initial sessions. We hear it from grandparents in waiting rooms. Sometimes — and this is the part we want to be honest about — we hear it from other professionals, framed as cautionary advice to families. The worry behind it is sincere and understandable. Most parents desperately want their child to develop spoken speech, and the suggestion that AAC might somehow get in the way of that is a frightening thought.

Here's what the research actually shows.

Two decades of consistent findings

Diane Millar, Janice Light and Ralf Schlosser (2006) conducted the meta-analysis that really established this question in the literature. They reviewed studies of children with developmental disabilities — 23 studies covering 67 individuals — and looked at what happened to spoken speech production when AAC was introduced. The headline finding: not one of the 67 individuals showed a decrease in spoken speech. The majority either maintained their existing speech or showed gains.

Two years later, Schlosser and Wendt (2008) ran a similar systematic review focused specifically on autistic children. Same finding: AAC did not impede spoken speech development, and in many cases was associated with gains in natural speech. ASHA's official position has reflected this evidence for years.

Romski and colleagues (2010) then provided the gold-standard test — a randomised controlled trial. Toddlers with developmental delays were randomly assigned to receive either augmented language intervention (incorporating AAC) or non-augmented intervention. The augmented group developed more spoken vocabulary, not less.

And bringing all of this up to date: Pope, Light and Laubscher's 2024 systematic review and meta-analysis showed that combining AAC with naturalistic developmental behavioural interventions produces stronger language outcomes than naturalistic intervention alone for autistic children with minimal speech.

AAC does not slow down spoken speech development. In most studies, it is associated with more speech, not less.

Why does this make sense, when intuitively it might seem the opposite?

A few reasons emerge across the research, and across our clinical experience:

1. AAC reduces the pressure on the motor system

Speaking is a motor task. For a child with CAS or with significant speech production difficulties, every attempt at speech requires enormous motor planning effort. When that's the only available route to communication, every interaction feels effortful. AAC offers an alternative that doesn't require the same motor demands — which paradoxically often frees the child up to produce speech when it's available, because the stakes around any individual word are lower.

2. AAC lets a child experience successful communication

Children who have experienced repeated communication breakdown develop, very understandably, a kind of communicative caution. Why try, if it usually doesn't work? AAC interrupts that pattern. The child sees that pressing this symbol gets that response. Communication becomes a meaningful, reciprocal experience again. That motivation transfers to all forms of communication, including speech.

3. AAC models the structure of language

This is something that often gets missed. When communication partners model on a child's AAC system — pointing to symbols as they speak, building up sentences in front of the child, narrating the day on the device — the child is being shown the structure of language at a pace they can take in. Aided language input, modelled consistently, supports comprehension as much as expression.

4. AAC lowers the anxiety around speech attempts

Particularly for older children who have become aware of their own speech difficulties, the mounting anxiety around speech attempts can become a barrier in itself. AAC, paradoxically, can free a child to try speech — because the device is there if needed.

What about robust AAC, specifically?

"AAC" covers a wide range of systems, from low-tech picture exchange to high-tech speech-generating devices with thousands of words. The research consistently supports robust AAC — systems that give the child access to a substantial, generative vocabulary, including core words, fringe vocabulary, and the ability to combine words into novel sentences.

Some examples of robust AAC systems include LAMP Words for Life, Grid for iPad with appropriate vocabulary sets, Proloquo2Go, TouchChat, and others. The choice between systems should be guided by careful clinical assessment, including considerations of motor access, sensory needs, vocabulary fit, and how the child experiences the system over time. Device rejection — which we see frequently in our practice — usually points to a mismatch between system and child rather than to AAC being "wrong" for that child.

So what do we say to parents?

We say: the research is clear. AAC does not stop your child from talking. In most studies, it supports speech rather than blocking it. We say: AAC isn't a backup plan, it's part of the plan — part of how your child experiences language now, while we work on whatever motor speech goals are appropriate. We say: your child's communication is not a single channel that has to be either/or. They can vocalise, gesture, sign, use their device, scripts, melodies — all of it counts as communication, and all of it builds the foundation for what comes next.

Robust AAC isn't a backup plan. It's part of the plan.

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References

Millar, D. C., Light, J. C., & Schlosser, R. W. (2006). The impact of augmentative and alternative communication intervention on the speech production of individuals with developmental disabilities: A research review. Journal of Speech, Language, and Hearing Research, 49(2), 248–264.

Pope, L., Light, J., & Laubscher, E. (2024). The effect of naturalistic developmental behavioral interventions and aided AAC on the language development of children on the autism spectrum with minimal speech: A systematic review and meta-analysis. Journal of Autism and Developmental Disorders. Advance online publication.

Romski, M., Sevcik, R. A., Adamson, L. B., Cheslock, M., Smith, A., Barker, R. M., & Bakeman, R. (2010). Randomized comparison of augmented and nonaugmented language interventions for toddlers with developmental delays and their parents. Journal of Speech, Language, and Hearing Research, 53(2), 350–364.

Schlosser, R. W., & Wendt, O. (2008). Effects of augmentative and alternative communication intervention on speech production in children with autism: A systematic review. American Journal of Speech-Language Pathology, 17(3), 212–230.

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Best wishes,

Sara & Rebecca