“I Can’t” Is Information

School starts with a list.

The week starts with demands. Get your shoes. Say good morning. Sit. Eat. Answer. For some autistic people, that stack is not stubbornness. It is a nervous system treating every request as a loss of control.

This month Autism Parenting Magazine ran a PDA summit, and ADDitude updated its explainer on August 17. Both are writing about the same pattern: what looks like “I won’t” is often “I can’t.” This piece is for the adult in the room who needs a sentence that works today.

Can’t, not won’t

PDA is not a DSM-5 diagnosis. It is a profile, first described by developmental psychologist Elizabeth Newson, of intense demand avoidance driven by anxiety and a need for autonomy. Many people now say “pervasive drive for autonomy” instead of “pathological.” The first phrase is more accurate. The second one sounds like a character flaw.

ADDitude’s comparison is useful: oppositional defiant disorder is framed as won’t. PDA is framed as can’t. Avoidance can show up for chores, and also for ice cream, a greeting, or a birthday the person asked for. Enjoyable things still count as demands when they come with an audience, a timeline, or an expected yes.

That is not the same as a student covering their ears because the bell is too loud.

Sensory load and demand load often travel together. Treat both as information.

A 2026 study in Research in Autism looked at 795 children. Anxiety and autism traits tracked demand avoidance in every group. Sensory sensitivity and sensory seeking uniquely showed up in the autism-plus-PDA group. That is more reason to treat lights, noise, and touch as part of the demand, not as a side note.

What a demand actually is

A demand is not only “Do your homework.” It is also a question that requires an answer. Praise that raises the bar for next time. A reward chart that turns help into a test. An internal cue: eat, use the bathroom, start the thing you like. A charged AAC device sitting unused because someone is waiting for “calm enough.”

Avoidance can look like distraction, negotiation, going quiet, role-play, or a body that will not move. Pushing harder usually makes the threat bigger. Low-demand language makes the room smaller.

Language that leaves the door open

Try these instead of a direct order.

I wonder if the coat is warm enough.

I notice the hallway is loud. We can wait here.

• Two choices, both acceptable. Cereal or toast.

• Written plus spoken. One step. Then stop talking.

• Neutral notice, not praise as pressure: You did it. Not: Great job, now do the next one.

• If the person uses AAC, model the device. Do not confiscate it. “I need a break” and “I can’t yet” are successful communication, not a behavior to extinguish.

A low-demand plan for home and school

• Name the demand. Is it sensory, social, time, or control?

• Drop the audience. Side-by-side, not face-to-face.

• Offer a real choice, including the choice to delay.

• Keep one instruction. Write it down.

• Plan a way out before you enter the room.

• Repair after, not punish. The goal is a nervous system that can come back.

Capacity changes by hour and by setting. Fine at school, wrecked at the front door is not a fake-out. It is the bill coming due.

What we are not doing

We are not diagnosing from a blog post. We are not treating demand avoidance as ODD with a new name. We are not hunting for a cause of autism. We are changing the sentence in the room: “I can’t” is information.

Sources

ADDitude, Diane Gould / PDA North America, “Your Child’s Pervasive Drive for Autonomy,” updated August 17, 2026. https://www.additudemag.com/pathological-demand-avoidance-pda-overview/

Autism Parenting Magazine, Sharon Longo, “Autism PDA: Understanding Pathological Demand Avoidance,” July 29, 2026. https://www.autismparentingmagazine.com/pathological-demand-avoidance-autism/

PDA Society, helpful approaches for children. https://www.pdasociety.org.uk/life-with-pda-menu/family-life-intro/helpful-approaches-children

O’Nions E, Gould J, Christie P, Gillberg C, Viding E, Happé F. Identifying features of ‘pathological demand avoidance’ using the DISCO. Eur Child Adolesc Psychiatry. 2016. https://pubmed.ncbi.nlm.nih.gov/26224583

Rai A.J., Rishworth B., Gutierrez R., Ludlow A.K. Sensory reactivity and intolerance to uncertainty: What characterises demand avoidance behaviours in children and adolescents with pathological demand avoidance? Research in Autism, 2026. https://doi.org/10.1016/j.reia.2026.202816