Vagus Nerve Stimulation (VNS)
A Science-Based Approach to Neuromodulation and Brain–Body Regulation
Vagus nerve stimulation (VNS) is a form of bioelectric neuromodulation that influences brain and body function by stimulating afferent fibres of the vagus nerve. Rather than acting through medication, VNS modulates neural systems using carefully controlled electrical signals, with the aim of supporting regulation, learning, and recovery.
At Ormond Neuroscience, we use non-invasive transcutaneous auricular vagus nerve stimulation (taVNS) as part of a broader, evidence-informed brain health and rehabilitation framework called Neuroharmonics.
What Is Vagus Nerve Stimulation?
VNS refers to a family of neuromodulation techniques that stimulate the vagus nerve in order to influence central nervous system function. Several forms of VNS exist:
- Implanted VNS, which requires surgery
- Non-invasive cervical VNS, applied to the neck
- Transcutaneous auricular VNS (taVNS), applied to specific regions of the ear
These approaches differ in invasiveness, regulatory status, and clinical application, but share a common biological rationale: modulating brain–body signalling via the vagus nerve.
The taVNS we use at Ormond Neuroscience does not require surgery and is generally well tolerated when applied conservatively.
Why the Vagus Nerve Matters
The vagus nerve is the primary conduit of communication between the brain and many internal organs, including the heart, lungs, and gastrointestinal tract. Importantly, most vagal fibres carry information from the body to the brain, shaping how the brain regulates:
- autonomic balance
- arousal and stress physiology
- emotional and interoceptive states
- immune and inflammatory signalling
Because of this central regulatory role, the vagus nerve is a biologically plausible and clinically relevant target for neuromodulation.
How Can Stimulating the Ear Influence the Brain?
Detailed neuroanatomical research has shown that a small branch of the vagus nerve terminates in specific regions of the external ear. Stimulation of this auricular branch activates brainstem nuclei that project widely to systems involved in attention, arousal, learning, and regulation.
Rather than “forcing” the brain to change, VNS modulates the conditions under which change becomes possible — influencing how readily the brain adapts to experience, rehabilitation, and therapy.
What Does the Scientific Evidence Show?
VNS is not an alternative or fringe therapy. Different forms of vagus nerve stimulation have been studied extensively, and some have been approved by regulators such as the Food and Drug Administration for specific medical indications.
Key points to understand:
- Implanted VNS is FDA-approved for drug-resistant epilepsy and treatment-resistant depression
- Non-invasive cervical VNS is approved for certain headache disorders
- Auricular VNS (taVNS) is not yet FDA-approved as a standalone medical treatment, but is supported by a growing body of experimental and clinical research
Importantly, the strength of evidence varies by application, and VNS should be understood as a modulatory adjunct, not a cure.
Core Physiological Effects of VNS
Across studies and clinical contexts, VNS appears to influence a small number of core physiological systems, including:
- Autonomic regulation, often reflected in changes in heart-rate variability
- Neuromodulatory systems involved in learning and plasticity
- Stress and arousal regulation
- Neuroimmune and inflammatory signalling
These shared physiological effects help explain why VNS can be relevant across different conditions without being condition-specific.
How We Use VNS at Ormond Neuroscience
We use VNS conservatively and deliberately, guided by current evidence and clinical judgement:
- Non-invasive auricular (ear) stimulation
- Sub-threshold intensity (typically barely perceptible)
- Always paired with active rehabilitation, therapy, or behavioural change
VNS is never used in isolation. It is one component of a broader programme aimed at creating the biological, psychological, and behavioural conditions under which recovery and adaptation can occur.
What VNS Can — and Cannot — Do
VNS can:
- support regulation and recovery
- enhance learning when paired with experience
- modulate physiological systems involved in stress and adaptation
VNS cannot:
- replace rehabilitation, psychotherapy, or medical care
- act as a passive or instantaneous solution
- guarantee outcomes independent of effort and context
Clear expectations are essential for meaningful benefit.
Learn More
To explore how VNS is applied in specific contexts, please also see:
Ormond Neuroscience Web Pages
- Vagus Nerve Stimulation (Overview) – a general discussion of the benefits and mechanisms of VNS
- VNS and Neuroplasticity – how neuromodulation supports learning and recovery.
- VNS and Mood & Autonomic Regulation – how brain–body regulation shapes emotional states.
- VNS for Stroke and Brain Injury Rehabilitation – how neuromodulation facilitates recovery after stroke, traumatic brain injury, brain tumours and related conditions.
- VNS for Autonomic Dysfunction and Stress-Related Conditions (in development).
- VNS for Epilepsy – how VNS helps to reduce the frequency and severity of epileptic seizures.
Interviews & Recordings of Digby discussing the neuroscience of VNS
The groundbreaking potential of vagal nerve stimulation
A recording of a TedX talk delivered to TEDxJohannesburg. They describe themselves as “A community of curious, open-minded people who care deeply about celebrating local ideas, and sharing them with the world. Everyday we look for remarkable people doing great work. We give them a platform and amplify their ideas. We believe that their ideas, delivered at our sought-after events, and distributed via video on the web, will change the world.”
“Digby Ormond-Brown reveals the transformative power of non-invasive vagus nerve stimulation (VNS). From post-traumatic stress disorder to stroke rehabilitation, Ormond-Brown shares poignant stories showcasing VNS’s versatility. Delving into the scientific underpinnings, he connects VNS to neuroplasticity and the vagus nerve’s role in healing. With eloquence, he discusses the revolutionary impact of VNS on diverse conditions, cautioning about the need for controlled application. Ormond-Brown paints a compelling vision of a future where VNS orchestrates a neural symphony, unlocking the brain’s potential for recovery. This talk promises to inspire and illuminate the extraordinary possibilities within our own minds.”
Waxing Clinical – Vagal Nerve Stimulation: Neuromodulation for mind-brain health
This webinar was hosted by the Netcare Group as part of their regular medical education programme, Waxing Clinical, which is aimed at healthcare professionals. This hour-long session discusses some basic principles of brain function and then focuses on the treatment of mood disorders using vagus nerve stimulation. To elucidate how VNS works, specific information regarding the mechanism of action and underlying neurophysiology of VNS are discussed. This is a technical but eye-opening discussion of noteworthy findings in the neurosciences in the field of VNS.
(Hint: Fast forward to the 5 minute mark to avoid the waiting period while people were logging on.)
A holistic approach to brain health
Medical Academic, publisher of medical journals and webinars, hosted a live presentation with Digby. While the presentation is behind a paywall, they published a written interview.
“In this far-reaching interview, neuropsychologist Digby Ormond-Brown explores vagus nerve stimulation’s role in treating epilepsy and anxiety, emphasizing its integration within broader brain health strategies. He discusses the gut-brain axis’ impact on neurodegeneration and shares groundbreaking results in cognitive rehabilitation, revealing how multimodal interventions can potentially reverse Alzheimer’s progression.”
Cognitive Decline, Dementia, & Neuroplasticity
Longevity Magazine hosted a talk with Digby about VNS, especially in the context of age-related cognitive decline. Here’s a summary as a written interview.
“There’s new hope for people with declining or impaired brain function, dementia, and cognitive decline thanks to a new novel, non-invasive treatment and vagus nerve stimulation (VNS). This medically administered therapy boosts neuroplasticity, the brain’s ability to reorganise and heal itself. Specialist neuropsychologist Digby Ormond-Brown explains how to repair the brain, build neuroplasticity, and achieve longevity.”
If you would like to know more, please get in touch.
