trauma

About polyvagal theory

Our research in trauma is informed by the polyvagal theory, developed by IU Distinguished University Scientist Dr. Stephen PorgesThe theory centers around the Vagus nerve, which is the longest nerve in the body and part of the parasympathetic system that regulates functions like our breathing, heart rate, and digestion.

The polyvagal theory explains how our autonomic nervous system exists in one of three main states, each activated based on perceived safety or threat:

  • Ventral Vagal State (Social Engagement): This state is associated with feelings of safety, connection, and social engagement.
  • Sympathetic State (Fight-or-Flight): This state is activated when danger is perceived, triggering the fight-or-flight response, characterized by increased heart rate, rapid breathing, and heightened alertness.
  • Dorsal Vagal State (Freeze): This state is activated in response to overwhelming or prolonged threat, leading to a state of immobilization or "shutdown". 

Additional resources