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Non-invasive Vagus
Nerve Stimulation

What is it and how does it work?

The Safe and Sound Protocol (SSP) is an acoustic, non-invasive vagus nerve stimulator created by Dr. Stephen Porges, author of the Polyvagal Theory. This tool can be used by mental and physical health therapists to help clients access a physiological state conducive to well-being, positive engagement with others, and growth in learning and therapy.

See how the Safe and Sound Protocol works. Download the free guide here.

The Science and Benefits of
Vagus Nerve Stimulation

The vagus nerve helps to regulate many critical aspects of human physiology, including the heart rate, blood pressure, sweating, digestion, and even speaking. As the body takes in information automatically through neuroception, the vagus nerve processes the signals and cues from the world around us and determines how we react through the three physiological states.

Due to neuro-developmental differences, early developmental trauma or other factors like anxiety or sensory processing differences your clients’ autonomic nervous system may be stuck in a sympathetic or dorsal vagal state, which can present in a variety of ways.

Being stuck in a sympathetic or dorsal vagal state can present in a variety of ways including: hypervigilance, dissociation, social anxiety or isolation, struggles with transition or changes in routine, poor sleeping, eating, or toileting, avoidance, refusals and/or difficulty following directions, frequent emotional upset and disruptive behaviors.

If chronic, these states can inhibit the outcomes of traditional therapy and result in a physiological feedback loop of defense. But by stimulating the vagus nerve appropriately, tools like the Safe and Sound Protocol can help your clients ease out of this state of chronic defense and become more available for therapy.

The three physiological states:


Parasympathetic / Ventral Vagal State
Our centered “true self” state, where all social interaction, connection and cognition occurs


Sympathetic State

Feeling of threat or danger, and feeling the need to either “fight” or “flee” from a situation to seek safety


Dorsal Vagal State

Our “freeze” state, when we feel our lives are so immediately threatened that we become immobilized

The Physiological Feedback Loop of Defense

The Safe and Sound Protocol interrupts and redirects this feedback loop with cues of safety.

The SSP interrupts chronic states of nervous system defense by stimulating the neural networks associated with listening.

The SSP uses algorithmically filtered music focused on the frequency range of the human voice that alters the way sounds are interpreted.

This ushers the nervous system out of a defensive (fight, flight or freeze) state and into a socially engaged (ventral vagal) state.

Support Your Clients’ Nervous Systems with the SSP

For professionals ready to integrate vagus nerve stimulation or other Polyvagal Theory-based tools, book a free, personalized demo today to learn how the SSP can work for your clients and how you can build it into your unique practice.

Continue Your Learning

These resources will provide an introduction to Polyvagal Theory and the Safe and Sound Protocol.

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E-Book: The Polyvagal Theory and You
Download this free eBook for a simple and visual explanation of Polyvagal Theory and the nervous system, suitable for children and adults.

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Infographic: The Organizing Principles of Polyvagal Theory
Download this free educational infographic based on the teachings of Polyvagal Theory expert Deb Dana, LCSW.

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Webinar: Simplifying the Safe and Sound Protocol
Watch this on-demand webinar to get an in-depth understanding of Dr. Stephen Porges’ Safe and Sound Protocol.

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