#186: It's Not Defiance, It's PDA (with Casey Ehrlich) Encore

The one who melts down at the smallest request, who seems to dig in the moment you say "do this."...you know this child. In this episode I sit down with Casey Ehrlich, PhD — social scientist, founder of At Peace Parents, and a leader in the first peer-reviewed PDA research in the United States — to talk about PDA: what it is, why it's a nervous system response rather than defiance, and what actually helps. PDA isn't defiance. It's a survival-level drive for autonomy — and once you see that, you respond to the child in front of you completely differently. PDA most often stands for pathological demand avoidance, but many autistic people prefer pervasive (or persistent) drive for autonomy — because autonomy is right at the root of what activates the nervous system. Casey defines it as a survival drive for autonomy and equality that can override other survival instincts like eating, sleeping, toileting, and even safety. We talk through what PDA actually looks like in young children, why behavior that reads as oppositional or manipulative is so often a nervous-system response, and the practical, compassionate shifts that help a dysregulated child feel safe again — in the classroom and at home. We'll talk about: ● what PDA stands for — and why many autistic people prefer "pervasive drive for autonomy" ● why demand avoidance is a nervous system response, not manipulation or defiance ● the five characteristics Casey looks for, including equalizing behavior ● why we flip the order for PDA kids: nervous system and autonomy first ● the difference between independence and autonomy ● real strategies: signals of safety, declarative language, and rhythms over routines In This Episode, You'll Learn • What PDA is, and why "pervasive or persistent drive for autonomy" may describe it better • How a survival drive for autonomy can override eating, sleeping, toileting, and safety • Why "equalizing behavior" can look oppositional but is actually a nervous-system response • How to read the early signals that a child is moving toward fight-or-flight • Why reducing spoken language and using declarative language lowers perceived demands • How to send signals of safety with your face, tone, and body — and why getting low matters • What the "four S's" — safe nervous system, screens, sensory/novelty, special interest — reveal about regulation • Why repair and felt safety, not teaching, are the moves in the hard moment Key Takeaways • PDA is a nervous system response, not defiance or manipulation • Autonomy is at the root — a perceived loss of autonomy activates the survival brain • For PDA kids, think nervous system and autonomy first, then sensory, executive function, and communication • Independence is doing a task alone; autonomy is having a genuine say in what happens • Signals of safety often matter more than words • Declarative language lowers the demand a child perceives • Think rhythms, not rigid routines — even a chosen routine can start to feel like lost autonomy • Compassion over compliance — always Try This • Pause and ask whether a behavior might be a nervous-system response to a perceived demand • Lower the demand: swap questions and directions for declarative, observational statements • Get low to the child's level and soften your face, tone, and pace • Offer real autonomy — a genuine say, not just a choice between two adult-chosen options • Reduce spoken language during escalation and wait for the child to re-engage • Build in rhythms instead of rigid routines • In the hard moment, focus on repair and felt safety, not on teaching the lesson Related Resources & Links 💚 Casey Ehrlich — At Peace Parents (free PDA masterclass) 💚 At Peace Parents Podcast 💚 The Declarative Language Handbook by Linda K. Murphy 💚 Free Visual Support Starter Set 💚 Autism Little Learners Membership When we stop asking "How do I get this child to comply?" and start asking "What is this child's nervous system telling me?" everything changes. PDA kids aren't giving us a hard time — they're having a hard time. And when we lead with autonomy, safety, and compassion, we give them what they actually need to come back to calm and connection.