PDA: Nervous System & Polyvagal Theory

PATHOLOGICAL DEMAND AVOIDANCE (PDA) THROUGH THE LENS OF POLYVAGAL THEORY AND THE NERVOUS SYSTEM

Pathological Demand Avoidance (PDA) is a profile within the autism spectrum characterised by an overwhelming avoidance of everyday demands. This avoidance is not simple defiance; it is rooted in heightened anxiety, driven by the nervous system perceiving demands as threats. Viewing PDA through the lens of Polyvagal Theory—a framework developed by Dr. Stephen Porges—provides invaluable insight into how a child’s nervous system reacts to demands and offers strategies to help them achieve a state of regulation and safety.

Understanding the Nervous System and Polyvagal Theory

Polyvagal Theory explains how the autonomic nervous system (ANS) responds to perceived safety or danger. It describes three primary states:

1. Ventral Vagal State (Regulated, Safe, and Social)
   • What it is: This is the optimal state where individuals feel safe, connected, and capable of engaging socially.
   • How it presents: In a ventral vagal state, a child with PDA might be calm, curious, and open to interaction. They can participate in activities, engage in relationships, and approach challenges with flexibility.
   • Why it matters: This state allows children to regulate emotions, process information, and respond adaptively to demands.

2. Sympathetic State (Fight or Flight Response)
   • What it is: This state activates when the nervous system detects a threat, prompting either a fight (defensive) or flight (escape) response.
   • How it presents: A child with PDA might become argumentative, defiant, or physically agitated (fight) or avoidant, restless, or withdrawn (flight). This state often arises when demands are perceived as overwhelming.
   • Why it matters: Children in this state struggle to process demands constructively, as their focus shifts to survival rather than engagement.

3. Dorsal Vagal State (Shutdown or Freeze)
   • What it is: This is a protective state where the nervous system slows down to conserve energy in the face of perceived overwhelming threat.
   • How it presents: A child may become apathetic, withdrawn, or appear disconnected. They might avoid eye contact, struggle to respond verbally, or exhibit a lack of energy or motivation.
   • Why it matters: Shutdown prevents meaningful engagement and can exacerbate feelings of isolation and helplessness.

What Are Perceived Demands in PDA?

Demands, in the context of PDA, encompass anything that the child interprets as an expectation, obligation, or pressure to act. It is critical to note that demands are defined by the child’s perception, not by the intent of the person giving the demand. Common types include:

• External Demands: Instructions, rules, or expectations from others (e.g., “Put on your shoes,” or “Finish your homework”).
• Internal Demands: Self-imposed pressures, such as striving for perfection or adhering to personal routines.
• Implied Demands: Subtle cues, such as choices (“Do you want an apple or a banana?”), praise (“You’re so good at this!”), or even social norms like greeting someone.
• Social Demands: Expectations to engage in conversation, take turns, or follow unspoken rules of social interaction.
• Sensory Demands: Overwhelming stimuli, like noise, light, or touch, which compound the perceived pressure of demands.

For a child with PDA, these demands can trigger an overwhelming stress response, pushing them into a fight/flight or shutdown state.

Supporting a Child to Reach a Ventral Vagal State

Helping a child with PDA achieve a regulated state requires reducing perceived threats and creating an environment of safety and connection. Here are strategies tailored to each nervous system state:

1. When the Child Is in Fight or Flight (Sympathetic Activation)

• Signs: Agitation, refusal, defiance, or physical restlessness.
• Support:
  • Reduce demands: Temporarily remove or reframe the demand to lower the immediate pressure.
  • Use calming techniques: Deep breathing, rhythmic movement (e.g., swinging), or offering sensory tools can help soothe their nervous system.
  • Stay neutral and calm: Avoid escalating the situation with frustration or urgency.

2. When the Child Is in Shutdown (Dorsal Vagal State)

• Signs: Withdrawal, lack of response, or appearing “spaced out.”
• Support:
  • Provide connection: Gently invite the child to re-engage without pressure (e.g., “I’m here when you’re ready”).
  • Offer grounding activities: Sensory input, like holding a soft object or engaging in a repetitive motion, can help bring them back into the present moment.
  • Respect their pace: Avoid pushing them to respond immediately. Allow time for recovery.

3. Encouraging the Ventral Vagal State (Regulation and Safety)

• Create a predictable environment: Consistent routines and visual schedules help reduce uncertainty.
• Use indirect language: Frame tasks playfully or collaboratively (e.g., “I wonder if the toys can tidy themselves?”).
• Focus on relationships: Build trust through empathy, validation, and shared humour.
• Celebrate autonomy: Offer choices and allow the child to take the lead when possible.

The Goal: Building Co-Regulation

Co-regulation is the process of supporting a child in regulating their emotions by offering your own calm presence and guidance. For children with PDA, co-regulation serves as a bridge to self-regulation. Practical steps include:

• Attuning to their needs: Pay attention to their cues and adjust your approach accordingly.
• Modelling regulation: Demonstrate calm and measured responses, even in challenging moments.
• Validating emotions: Acknowledge their feelings without judgment (e.g., “I see that this feels really hard for you right now.”).

Conclusion

Viewing PDA through the lens of Polyvagal Theory highlights the intricate relationship between a child’s nervous system and their responses to perceived demands. By understanding the three primary states—ventral vagal, sympathetic, and dorsal vagal—and recognising the unique nature of perceived demands, caregivers and educators can provide targeted support that fosters safety and connection.

The ultimate goal is to help the child access their ventral vagal state, where they feel regulated, secure, and capable of engaging meaningfully with the world around them. Through consistent co-regulation, reduced demands, and a focus on nurturing relationships, children with PDA can thrive in environments tailored to their needs.

References

Dana, D. (2018). The Polyvagal Theory in Therapy: Engaging the Rhythm of Regulation. W.W. Norton & Company.

Porges, S. W. (2011). The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation. W.W. Norton & Company.

Porges, S. W., & Dana, D. (Eds.). (2018). Clinical Applications of the Polyvagal Theory: The Emergence of Polyvagal-Informed Therapies. W.W. Norton & Company.

Eaton, J. (2018). A Guide to Understanding Pathological Demand Avoidance in Children: Understanding the Distinctive Features of PDA, and Strategies for Successful Support. Jessica Kingsley Publishers.

Christie, P., Duncan, M., Fidler, R., & Healy, Z. (2012). Understanding Pathological Demand Avoidance Syndrome in Children: A Guide for Parents, Teachers and Other Professionals. Jessica Kingsley Publishers.

Stuart, M., & Willey, I. (2020). Demand Avoidance Explained: Why Understanding Demand Avoidance is Key to Supporting Autistic Individuals. Pavilion Publishing.

Brown, S. M., & Elliott, S. A. (2016). “Polyvagal-informed therapy: Using the polyvagal theory to enhance emotional and social connection.” International Journal of Social Work and Human Services Practice, 4(5), 97-104.

Kupferstein, H. (2018). “Evidence of increased PTSD symptoms in autistics exposed to applied behavior analysis.” Advances in Autism, 4(1), 19-29. https://doi.org/10.1108/AIA-08-2017-0016

Attwood, T. (2007). The Complete Guide to Asperger’s Syndrome. Jessica Kingsley Publishers.