Why You're Walking On Eggshells: Cumulative Nervous System Activation And Your PDA Child Or Teen | Ep. 174
At Peace Parents PodcastShow Notes
Seven years ago I created a huge spreadsheet trying to find the cause of my son's meltdowns. How many hours outside, how many minutes on screens, how many calories eaten, and much much more. But I couldn't find a consistent pattern. Something that triggered him one day might be barely noticed another. The problem was, my logic was wrong. In this episode, an excerpt from our free Understanding PDA Masterclass, I explain why the standard ABC framework of antecedent, behavior, consequence fails for PDA children and introduce the cumulative nervous system activation model: how drops build in the bucket over weeks, months, and years toward a tipping point, and why what you do this week may determine whether your child can brush their teeth three weeks from now. Key Takeaways
Why the Spreadsheet Did Not Work | 00:00:00 When my son went into burnout, I tracked everything: screen time, calories, sleep, fresh air, meltdown frequency. I was looking for the antecedent - the thing that happened right before the blowup - that would tell me the cause. What I now know is the reason the spreadsheet could not find the pattern is that the logic of the PDA nervous system is not event-based. It is cumulative. The antecedent is not the primary cause. It is the tipping point.
The ABC Framework and Why It Does Not Apply to PDA | 00:01:45 The ABC framework - antecedent, behavior, consequence - is the foundation of most behavioral approaches in schools, therapy, and parenting. For some neurodivergent children it can be useful: the fluorescent lights went on, the meltdown followed, the consequence was leaving the room. For PDA children, the same surface-level event can produce completely different responses on different days, because the behavior is not caused by that event in isolation. It is caused by the cumulative level of nervous system activation that has been building in the system toward a threshold of tolerance over days, weeks, months, and in some cases years.
TDrops in the Bucket Toward a Threshold | 00:03:19 I use a glass of water to illustrate the threshold of tolerance: the point at which cumulative nervous system activation tips past the window and begins to disable basic needs. Every subconsciously perceived loss of autonomy or equality is a drop. With a PDA child, we may have fifteen drops before we have even finished breakfast. Those drops build continuously, which is why burnout can feel sudden, especially for internalized PDA teens who masked successfully for years before suddenly being unable to leave their room. My son's escalation into burnout felt like an autistic regression because it was so rapid, but looking back, the drops had been building in the system for years without anyone seeing it.
Why Behavior Fluctuates and Why That Makes It Hard to Trust the Disability Framework | 00:09:40 A PDA child may be able to brush their teeth at the beginning of the week but not by Friday. My older son's test scores drop between the start of the school year and the end, not because he has lost the skill or knowledge but because cumulative activation has made it harder to access. When things fluctuate like this, parents can doubt whether what they are seeing is really a disability, because the inconsistency does not match how we think disabilities look. This fluctuation is actually a feature of the cumulative model: accommodation brings activation down, and the child moves away from their threshold. Activation builds it back up.
Two Out of Three Is Enough | 00:12:58 You do not have to accommodate perfectly for this model to work. Every accommodation removes a drop from the bucket. Every activation adds one. If your co-parent is not yet on board, your accommodations are still helping, just more slowly. If your child is in a school that is adding drops while you remove them at home, progress will be slower but not impossible. The practical implication is that what you do this week, this month, in the next three weeks, is directly connect
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