(Sorry for the long review this time. I found this book incredibly helpful and there was so much good info.)
This deeply insightful read explains how the nervous system, especially the vagus nerve, shapes our responses to safety, stress, and trauma.
The core idea behind polyvagal theory is that the nervous system has three different states in which it can exist, each controlled by the separate pathways of the vagus nerve. The three states are: 1) the ventral vagal state (what was formerly called the parasympathetic pathway or "rest and digest" mode, characterized by feeling "safe", aka the "green zone"); 2) the sympathetic state (aka "fight or flight" mode, the "yellow" zone); and 3) the dorsal vagal state (aka "freeze" or shutdown mode, the "red" zone). It is important to note that, according to the theory, it is not possible to jump from green to red or from red back down to green without passing through the yellow zone.
Certain situations and circumstances trigger the activation of each of these states. However, there are practices and conditions that can help calm the nervous system when it enters the yellow or red zones, and others that promote sustained regulation in the green zone. The more time our minds and bodies spend in the yellow or red zones, the greater the toll on both mental and physical health. On the other hand, the more time we spend in the green zone, the more we regulate mentally and emotionally and the more easily we physically heal and recover. I found it interesting that the number one method to get into or stay in the green zone is positive social interaction (can include conversation, laughing, singing or moving together).
The research summarized in this book has applications not only for mental and physical healing, but also for societal changes in schools, offices, and even prisons. A deeper understanding of polyvagal theory offers important insight into human behavior, emotional regulation, and paths to healing.
(On a personal note, for me I think stress and anxiety (fueled by cortisol) fall under the yellow zone, while panic (fueled by adrenaline) falls under the red zone. Each sensation feels distinct to me, and requires different methods to regulate. While calming activities such as deep breathing or taking a bath help calm me when I'm in the yellow zone, they don't work in the red zone. However, consistent participation in these activities and others (meditation, yoga, time in nature, positive social interactions) can help calm me from the yellow zone to the green, or even a lower level of yellow, preventing me from entering the red zone.)