“Broadly speaking, the vagus nerve is always associated with the parasympathetic nervous system and has an inhibitory influence upon the heart and sympathetic nervous system activity. Most importantly, Porges’ research identified that the parasympathetic nervous system has two presentations that depend upon whether you feel safe or feel threatened. In times of safety, the parasympathetic nervous system facilitates rest, relaxation, and digestion. However, in times of threat the parasympathetic nervous system has a defensive mode…”
Source: Polyvagal theory unlocks symptoms of PTSD | Dr. Arielle Schwartz
