I am reading a great book called Accessing the Healing Power of the Vagus Nerve by Stanley Rosenberg.

He observes many of the same things that Postural Restoration talks about, particularly when it comes to the importance of head and neck rotation via the SCMs and trapezius muscles.

The neck is autonomic, meaning its function is dependent upon, and will alter the function of, your autonomic nervous system. It's intimately tied to all your sensory organs: eyes, teeth, tongue, and nose. These sensory organs allow us to "face the world" and interact with our surroundings.

When any of those sensory organs are not functioning properly, it can cause our vagus nerve to malfunction. Conversely, a malfunctioning vagus nerve can alter our ability to interact with our environment effectively.

For more information about the role of the neck and the right TMCC pattern:
https://pritrainer.com/right-tmcc-pat...