I'm not really the perfect audience for this book so don't take my 3 star rating as a major critique. I liked the book, but didn't find it life changing or so incredible to warrant a 5 star review the way some therapists may find this completely changing their practice. Disclaimer over.
This was a really cool book. For someone interested in neuroscience, emotions, how we act etc it is very approachable yet deep. It outlines the work of Dr. Porges on the Polyvagel theory then offers a lot of ways to integrate the theory into clinical practice. I was able to get a ton of value out of it in a 2 hour reading session.
My mom suggested I read this book after I mentioned am interest in decision science. While I don't know how to qualify or quantify the accuracy of the science other than it is from a respected researcher who worked on it for decades, I did enjoy some interesting learnings about emotions and emotional regulation concepts.
#1: Ventral vagal nerves
Polyvagel theory is about the anatomy of survival, Deb claims. The two vagal nervous systems and the sympathetic nervous system all work to help us survive. There's a hierarchy of these systems, she claims. We apply a "vagal brake" slowing down the heart when in a connected state. This is activation of the ventral vagal nervous bundle, a series of nerves connecting your lungs, heart, and face. The bundle has about 80% of its connections sending information to the brain and 20% from the brain to your motor system. This is evolutionary the most recent development and essential to mammalian abilities to connect. From this state you're most able to calmly react to whatever happens.
#2: Sympathetic nervous system:
When you feel a sense of danger this system kicks in (and in other situations). The "vagal" brake is released and your heart rate can climb. You take action often with this system activated. This is the 2nd most recent evolutionary system of the 3, Deb claims. One question I have is what system works when you're excited. For example, in taking these notes I feel my heart beating faster than when reading Deb's book. Is my sympathetic nervous system in action? In many ways I feel it is, but I don't feel fear. I'm excited to capture and digest the ideas and science I'm reading about. That part wasn't clear to me in this book.
In any case, Deb claims this is a lower system. From here you can return to the ventral vagal system and apply the "vagal brake" or go to the lowest/oldest system, the dorsal vagal bundle.
#3: Dorsal vagal nerves:
This system is the immobilization system, Deb claims. She uses the metaphor/phrases of "playing possum/dead" to explain it. These are the nerves that connect your gut to your brain via a vagal connection. When active you freeze and this can be a place/system to avoid. You'll go here sometimes but in trauma you get stuck here instead of regulating your way out. I can relate to this in jobs Ive felt stuck in. I've given up trying and in retrospect maybe immobilized myself in some ways. To get out she describes your sympathetic nervous system energy moving you to action and then out of immobilization.
#4: Therapeutic exercises:
Deb describes many exercises to build awareness of these 3 systems and eventually rewire/reshape them to enhance regulation. Breath is a key, connection is key, touch can help, she has many ideas. There's a lot of exercises in this book to work with Porges' Polyvagal theory and Deb describes many of them in the context of trauma work.
#5: Societal survival/power seeking vs. connection seeking
Conceptually it is interesting to see connection at the top of a hierarchy of this sort. We often seek control, power, autonomy as peak states, feelings and perspectives. Personally, as I age I do see the value in trust, connection and its intimate vulnerability as higher states than the ones that lead you to seek control, power or autonomy.
I can also understand many people's (and often my own) desires to seek the effects of the sympathetic nervous system as the goal/peak. When our heart rates and our body produces lots of adrenaline, cortisol, and the hormone cocktail we call flow, it feels great. Like an orgasm at times. I and others can seek that pleasure as superior to connection and its associations. There's a sense of power which can feel good.
Conclusion:
The Polyvagel neurobiological theory of our nervous system's functions, regulations and strategies is an interesting lens to look at society and decision science. As a techie it makes me want to experiment with measurements as teaching tools. If I ran a decision science lab I'd be interested in connecting Polyvagal theory to results on hunger's impact (e.g. judge's granting parole significantly less before lunch). As a data scientist working on behavior change it suggests an experiment with content and coaching to drive awareness and reshaping of the nervous system to avoid chronic health issues. Check out this book if you're interested in learning about our nervous system through a Polyvagal lens and consider how it could drive your work.