Polyvagal Theory - Science and Its Clinical Applications

Introduction:

The polyvagal theory was created by Stephen Porges in 1995. This theory is a new way of thinking about the connection between the human’s autonomic nervous system and behavior. It views the autonomic nervous system as part of an evolved complex system. It also emphasizes that neural circuits control it and regard autonomic responses as adaptive in terms of the evolution of the vertebrate nervous system. This theory calls for scientists to examine how neural mechanisms like the ones below elicit behavior. It also calls for general knowledge of the autonomic nervous system, including its connections with organs and the two-way communication between the heart and the brain.

What Does the Mechanism of Polyvagal Theory Involve?

The vagus nerve plays an important role in this theory. It extends from the brainstem region to the colon. The vagus nerve connects the mind and body and helps the brain monitor and manage many bodily functions. This nerve controls heart rate, blood pressure, temperature, digestion, and speaking. It sends information from the body to the brain, which then processes these signals and determines how we respond through three states: the parasympathetic (calm), sympathetic (alert), or dorsal vagal (shutdown) states.

Deb Dana's Contribution to Polyvagal Theory: Deb Dana (2018) describes the autonomic ladder as a way to visualize different physiological states.

• Parasympathetic or Ventral Vagal State: This calm and centered state is where we feel like our "true self." Interacting with others and forming connections occur in this state, and individuals also naturally become creative.

• Sympathetic State: This state occurs when one feels threatened or in danger. One may feel the urge to 'fight' or 'flee' to protect ourselves.

• Dorsal Vagal State: This is the freeze state. It happens when someone feels threatened and becomes immobilized and unable to act due to fear.

What Is Polyvagal Theory?

The polyvagal theory explains that the vertebrate autonomic nervous system develops in three stages. Each stage indicates a specific autonomic subsystem still present in mammals today. These subsystems are responsible for different behaviors:

1. Social communication (for example, facial expressions, vocalization, listening).

2. Mobilization (for example, fight-or-flight responses).

3. Immobilization (for example, feigning death, vasovagal syncope, behavioral shutdown).

1. Social Communication System: Social communication or engagement involves the myelinated vagus nerve. This nerve helps create calm states by reducing the influence of the sympathetic nervous system on the heart. It also controls the HPA or hypothalamic-pituitary-adrenal axis.

2. Mobilization System: The mobilization system activates the sympathetic nervous system. It leads to fight-or-flight responses.

3. Immobilization System: The immobilization system is the oldest one. It operates through the unmyelinated vagus nerve and is present in most vertebrates (not just mammals).

As organisms evolved and neural complexity increased, their range of behaviors and emotional responses expanded. The three subsystems (social communication, mobilization, and immobilization) interact dynamically. It also helps organisms adapt to safe, dangerous, or life-threatening situations.

How Does Neuroception Influence Polyvagal Theory?

Neuroception gives us the capacity to evaluate risk by processing sensory information without conscious thought. It distinguishes between safe, dangerous, or life-threatening situations. Neuroception in safe environments enables social engagement and keeps us in a non-aroused state, while in dangerous contexts, it initiates a defensive response.

Neuroception is the act of determining whether an environment is safe or dangerous. The process activates different brain structures (temporal cortex, amygdala, and periaqueductal gray). These structures are sensitive to familiar voices, faces, and particular gestures. Whenever the nociceptive process perceives an environment as safe, it thus gives an individual the green light to be social. A faulty perception might trigger an improper defensive response.

Internal states also have an important bearing on neuroception. Such internal bodily states may heighten or otherwise affect how social cues are perceived. With heightened physiological states, for example, the reaction to any social interaction may be rather negative, such as withdrawal or even aggression.

The insula has also been involved in integrating bodily feedback and emotional experience. It links the internal state to cognitive awareness and influences feelings and responses to social interactions. The theory is based on the gathered knowledge about how the autonomic nervous system in vertebrates has evolved.

How Is Polyvagal Theory Applied in Various Ways in Equine-Assisted Therapy?

In recent times, polyvagal theory has found wider application in equine therapy. The reason is that it covers a broad spectrum in understanding the involvement of the autonomic nervous system in social engagement and in the regulation of emotions. Equine therapy is one of the forms of an experiential therapy system. In such a form of therapy, engagement with horses is used to facilitate emotional and behavioral change in human beings. The presence of horses enhances awareness in an individual through various means, such as non-verbal communication, emotional regulation, and the development of trust and empathy.

Equine therapy, along with polyvagal theory, helps therapists understand the autonomic nervous system of the horse and, in turn, enables them to understand the human interacting with him. Professionals in equine therapy observe horses' behaviors-movement, facial expressions, or vocalizations-reflecting something about the state of their client's nervous system. Because horses are social animals, they are acutely responsive to the cues of others around them, making them viable co-therapists in this respect. Therapists can use horses to teach clients how to self-soothe and engage socially better through interactions with horses.

What Are the Clinical Importance of the Polyvagal Theory?

Polyvagal exercises calm the nervous system and reduce cortisol levels. It reduces anxiety and other symptoms associated with chronic stress. They might also be used to manage chronic pain since the vagus nerve is activated by these exercises, which would lead to good relaxation and decrease feelings of pain and tension within the muscles. More importantly, these exercises can be used in an attempt to decrease symptoms of anxiety and depression, for their effect resets the nervous system and nurtures emotional resilience. Positive social contact gives the foundation of stability and thereby reduces stress.

What Are Some Exercises Based on Polyvagal Theory?

Some polyvagal exercises that are related to polyvagal theory-

• Humming or Chanting: Find a quiet spot and hum a soothing tune. It is one way for stress reduction.

• Cold Exposure: A small splash of cold water on the face within minutes, the mood will lift. This exercise can be done quite frequently. It also helps one switch from stress to relaxation.

• Deep Breathing: Try inhaling for a count of four, holding for four, and again exhaling for six. This is the best stress-relieving exercise that works fast.

• Gargling: Gargle regularly with water. Make this a daily routine to help you be more relaxed.

• Social Engagement:

  • Positive interactions with others help activate the vagus nerve.

  • Talk with others to foster connections.

  • Maintain eye contact to strengthen bonds.

  • Pay close attention to others.

Conclusion:

Polyvagal theory explains how the nervous system affects emotions and physical health. It depicts the vagus nerve's role in managing stress and social interactions. Applying polyvagal exercises and therapeutic techniques can help manage stress, improve relationships, and enhance overall well-being.