Communication is bigger than speech. For some autistic adults, speaking works most of the time but breaks down under stress, sensory overload, or in unfamiliar settings. For others, speech doesn't develop reliably at all. Sign language has long been one of the tools available for autistic adults who want or need a non-speech way to communicate — but it's also widely misunderstood. 



ASL is a full natural language belonging to the Deaf community. "Baby signs" are something different. And in 2026, signing is one option among several, not the default. This guide walks through what sign language actually is, when it makes sense for autistic adults, what the research supports, and how to think about getting started in a way that respects both the autistic adult and the Deaf community whose language ASL is.

Why Communication Tools Matter for Autistic Adults

Communication differences are central to autism, but they affect adults far more than most people realize.

According to a 2025 review published in PMC (Communication in Autistic Adults: An Action-Focused Review), a substantial proportion of autistic adults do not develop fluent spoken language by adulthood, and many speaking autistic adults experience intermittent or unreliable speech — speech that works in one setting may break down in another. 

Healthcare research from Penn State Health notes that approximately 30% of autistic people don't develop more than a few words of spoken language; not all of them are truly nonverbal, and many can read, write, or recognize signed and gestured communication.

For all of these adults, having additional communication tools — including signed languages and gestures — can make daily life dramatically more accessible. The point isn't to replace speech for autistic adults who want to speak. It's to give every autistic adult more ways to be heard.

What "Sign Language" Actually Means (and Doesn't)

Several different things get called "sign language," and the differences matter.



American Sign Language (ASL). A full, natural language with its own grammar, syntax, vocabulary, and cultural community. ASL is the primary language of the Deaf community in the U.S. and parts of Canada. Learning ASL means learning a real language — comparable in time and effort to learning Spanish or Mandarin. It's not a translation of English; it has its own structure.

Signed Exact English (SEE). A manually-coded form of English that uses signs in English word order. Used in some educational settings.

Key Word Signing / Makaton. Borrowed signs (often from ASL) used alongside speech to highlight important words. This is a communication strategy, not a language — common in early childhood education and some autism programs.

"Baby signs." A small set of borrowed signs (eat, more, milk, all done) taught to hearing infants and toddlers. These are also a strategy, not a language, and they don't make a child fluent in ASL.

For autistic adults considering signing, the question to start with is: am I learning a language (ASL), or am I learning a few signs as a communication tool (key word signing)? Both are valid choices. They lead to different places.

When Sign Language Makes Sense for Autistic Adults

Signing isn't right for every autistic adult, and it's also not the only AAC option. It tends to fit well when:

• Speech is unreliable or intermittent and the person wants a backup that doesn't depend on a battery, app, or device
• The autistic adult is interested in the Deaf community or has Deaf family members or close friends
• Visual processing is a strength for the individual
• Manual dexterity supports clear sign formation
• The autistic adult has motivation to learn ASL as a language, not just as a tool

It tends to fit less well when:

• Manual dexterity or motor planning is significantly affected by co-occurring conditions
• The communication partner network can't or won't learn signs (signing only helps if someone can understand it)
• A picture-based or speech-generating AAC system would offer more independence in everyday settings
• The autistic adult is unmotivated — language learning at any age requires real engagement

Honest framing: signing is one tool. Whether it's the right tool depends on the specific person and the people they need to communicate with most.



Sign Language Compared to Other AAC Options

Augmentative and Alternative Communication (AAC) is the broader category that includes any communication beyond unaided speech. According to a foundational paper on autistic adults and AAC published in Autism in Adulthood (Zisk & Konyn, 2024), autistic adults use a wide variety of AAC tools — and signing is just one of them.

The current research on autistic adults and AAC strongly supports a flexible, multi-mode approach: many autistic adults use several different AAC tools depending on the situation. Sign language can be part of that mix without having to be the whole thing.



What the Research Says

The research base on AAC for autistic adults is smaller than the research on AAC for autistic children, but it's growing — and it's consistent on several key points.

AAC supports speech development; it doesn't replace it. This finding has been replicated repeatedly: introducing AAC, including signing, does not delay or harm spoken language development. In many cases, AAC supports it.

Communication outcomes improve. Multiple systematic reviews of AAC for autistic individuals (children and adults combined) have found significant improvements in communication skills, with effect sizes ranging from medium to strong.

Adults report real benefits. Qualitative research on autistic adults who use AAC, including signed forms, consistently reports increased independence, reduced communication breakdown in stressful settings, and better self-advocacy.

Barriers are real. Common barriers include lack of awareness, misconceptions about who AAC is "for," cost of dedicated devices, and limited training opportunities for adults. Signing has its own barriers — finding qualified instruction, finding signing communication partners, and the time investment of learning a language.

How to Start: A Practical Approach for Autistic Adults

If signing is a tool an autistic adult wants to explore, a few practical steps tend to work well.

Step 1: Get clear on the goal

Are you learning ASL as a language? Or learning a small set of signs to use alongside speech? Both are valid; they require different commitments.

• For ASL fluency: plan for ongoing language learning — classes, conversation practice, immersion in Deaf community spaces over months and years.
• For key-word signing or signs as backup AAC: a more focused approach — learning the specific signs you need most for daily life — works well.

Step 2: Find qualified instruction

For ASL specifically, look for:

• Local community colleges and universities with ASL course offerings
• Deaf community organizations that run ASL classes (often the highest-quality option)
• Accredited online ASL programs (with instructor feedback, not just videos)
• Certified ASL instructors — Deaf instructors are often the best teachers when available

For key-word signing or basic signs, speech-language pathologists, certified ASL teachers, and AAC-trained clinicians can all help build a starter vocabulary tailored to the adult's daily life.

Step 3: Practice in real settings

Like any communication system, signs only become fluent through real use. Practice with family, in conversations, at appointments, and (when ready) within Deaf community spaces. The "lab table" approach — practicing signs in a clinical session and never using them outside it — rarely produces fluency.

Step 4: Build a signing community

Signing is a social skill. Without people to sign with, the system stays underused. Family and caregivers often need to learn alongside the autistic adult — even basic vocabulary — so signs can actually serve daily communication.

What About Sign Language Interpreters?

Some autistic adults — particularly those who use ASL as a primary language — work with ASL interpreters in medical, legal, educational, or workplace settings. Under the Americans with Disabilities Act, qualified ASL interpreters must be provided in many of these contexts when requested.

A few practical points worth knowing:

• Interpretation is a service the institution typically arranges and pays for, not the autistic adult or their family.
• Request interpreters in advance. Same-day requests rarely succeed; 5–7 days lead time is more realistic for most settings.
• VRI (Video Remote Interpreting) is increasingly available for situations where in-person interpretation isn't feasible.
• Choose interpreters trained in working with autistic clients when possible. Communication style and pacing can matter beyond linguistic accuracy.
• Bring a communication partner for high-stakes appointments. An interpreter handles the language; another person can provide context and advocacy.

For autistic adults who use ASL as their primary language, accessing interpretation as a right — not a favor — is an important part of self-advocacy.

Respecting the Deaf Community

ASL belongs to the Deaf community. Hearing autistic adults who choose to learn ASL are entering into a relationship with that community, not borrowing a tool detached from its source.

Practical ways this matters:

• Learn from Deaf instructors when possible. Their knowledge of language, culture, and history is part of what makes the language real.
• Don't claim Deaf identity. Hearing autistic adults who use ASL are not Deaf and shouldn't represent themselves as such.
• Engage with Deaf community spaces respectfully. Participating in Deaf community events, supporting Deaf-led organizations, and following Deaf advocates are all good ways to learn beyond the classroom.
• Recognize the difference between language use and language ownership. Using ASL doesn't make a hearing person part of the Deaf community in the same way speaking English doesn't make someone part of any specific English-speaking culture — but it does come with responsibilities.

This isn't a barrier to learning ASL — it's part of learning ASL.

How ABA Therapy Can Support Sign Language Learning

For autistic adults who want to incorporate signs as part of their communication, modern, individualized ABA therapy can play a supporting role. Effective programs can help with:

• Identifying which signs would be most useful for the adult's daily life and routines
• Practicing signs in real-life contexts (not just at a therapy table)
• Building generalization — using signs across settings, partners, and environments
• Coaching family and caregivers so signs are received as well as produced
• Combining signs with other AAC tools when a multi-mode approach fits

The goal of ethical ABA in this context is expanding the autistic adult's communication options, not narrowing them. Signing should be added to the toolkit because the adult wants it and finds it useful — not as a replacement for speech the adult is already using, or because someone else thinks they should sign instead of speaking. 

Conclusion

Sign language can be a real, useful communication tool for autistic adults — when it's the right tool for the right person. ASL is a full language with its own community; smaller sets of borrowed signs can serve as a backup when speech is unreliable. 

Either choice is valid. What matters is that the choice fits the individual, that learning happens with respect for the Deaf community whose language ASL is, and that signing sits in a broader AAC toolkit rather than being treated as a default for every autistic adult who doesn't speak.

At All Star ABA, we serve autistic teens, adults, and their families across Maryland — including Baltimore, Frederick, Rockville, Gaithersburg, Columbia, and Silver Spring — and across Virginia. Our bilingual BCBAs design individualized ABA programs that build communication skills across whatever modes work best — speech, signs, AAC, or any combination — with respect for autonomy at every step. We accept most major insurance plans, including Medicaid, and there's no waiting list to start.

If you're an autistic adult exploring sign language as a communication tool, or a family member helping someone you love expand how they're heard, start the conversation with our team — we'll meet you where you are.

Frequently Asked Questions

Sources

1. Communication in Autistic Adults: An Action-Focused Review. (2024–2025). PMC. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12271282/
   
2. Zisk, A. H., & Konyn, L. (2024). Augmentative and Alternative Communication for Speaking Autistic Adults: Overview and Recommendations. Autism in Adulthood. https://www.liebertpub.com/doi/10.1089/aut.2018.0007 (also available open-access via PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8992808/)
   
3. National Institute on Deafness and Other Communication Disorders. (2023). Minimally Verbal/Non-Speaking Individuals With Autism: Research Directions for Interventions to Promote Language and Communication. https://www.nidcd.nih.gov/workshops/2023/summary