Presuming autistic communication competence
What happens when clinicians, teachers, and parents start from the assumption that a nonspeaking autistic person understands what is being said around them?
A 2022 perspective piece in Frontiers in Psychology makes a simple, uncomfortable argument: most of the systems built around nonspeaking autistic people start from a presumption of incompetence. Standardized assessments rely on coordinated speech or pointing. Education is calibrated to test scores. Therapy goals get written for what the person appears able to do, not what they may actually understand.
The authors argue that this default is both empirically and ethically wrong.
The case from evidence
Motor differences in autism are now well documented. Apraxia, dyspraxia, and sensorimotor dysregulation can prevent a person from reliably producing speech, gesture, or even consistent pointing — without saying anything about what they understand. Receptive language and expressive ability come apart in this population in ways traditional testing was never designed to capture.
When researchers use methods that bypass the motor barrier — eye tracking, supported typing, AAC with appropriate scaffolding — many nonspeaking autistic people demonstrate far more language than their test scores predict.
The case from ethics
If we are uncertain whether a person understands, the cost of underestimating them is enormous: years of inappropriate education, denial of literacy instruction, social isolation, and being talked about rather than talked to. The cost of overestimating them is much smaller — at worst, a conversation that is a little above their head.
That asymmetry is the heart of the 'least dangerous assumption' principle. Presume competence by default. Adjust as you learn more about the individual.
What it changes in practice
Presuming competence is not a slogan. It changes how you speak to a person (in age-appropriate language, directly, not over their head), how you teach them (assume they can learn to read), and how you build communication access (give them robust AAC and the support to use it, not a four-button choice board).
Crucially, it leaves room for the person to surprise you — which, again and again, is what families and clinicians who adopt this stance report happens.