For years, I sat across from clients and listened to their stories. I trusted words, emotions, patterns of thought. Gradually, however, I began asking a question that therapy had long sidestepped: What is happening in the body while we talk?

That question led me to biofeedback and neurofeedback — methods that make it possible to work with the nervous system directly, measurably, and in real time. Not instead of conversation, but alongside it. Or before it. Or after it.

My work in therapy taught me to notice subtle signals — a shift in voice, a held breath, tension in the shoulders. The longer I worked, the more I felt that words were only part of the story. The nervous system communicates differently. Faster. Deeper. And most often — without conscious intent. When I first encountered biofeedback, I suddenly saw what I had long only sensed: the physiology beneath the surface of conversation.

What is biofeedback and neurofeedback?

Biofeedback is a method in which sensors capture physiological signals from the body — heart rate, breathing rhythm, muscle activity, skin conductance, or temperature — and display this data on a screen in real time. The client sees how their body responds to stress, to thoughts, to breath. And — crucially — they learn to consciously influence those responses.

Neurofeedback is a specific form of biofeedback that works directly with brain activity. Using electrodes placed on the scalp, it captures the EEG signal, and the client receives feedback about which brainwaves are dominant at any given moment. The brain learns to self-regulate — not through willpower, but through repetition and feedback.

Key principle: Both approaches draw on the nervous system's capacity to learn. Not through instruction, but through experience. Physiology changes when we observe it — and when we give it the right information.

Connection to Polyvagal Theory

My understanding of why biofeedback works opened up through Stephen Porges' Polyvagal Theory. This theory describes how the autonomic nervous system regulates our states of safety, defense, and shutdown — automatically, without our conscious consent.

Porges identified three evolutionary layers of autonomic regulation. Biofeedback allows us to measure the state of the nervous system in real time. Heart rate variability (HRV) reflects the tone of the ventral vagus — the higher and more rhythmic it is, the more the system is in a state of safety and flexibility. Skin conductance tells us about sympathetic activation. The breathing pattern shows how a client is regulating — or failing to regulate — their physiology.

Neurofeedback, in turn, works directly with the brain — for example, by strengthening alpha waves associated with calm wakefulness, or reducing hyperactivity in the beta range, which is characteristic of chronic stress and anxiety.

Polyvagal Theory gives biofeedback a theoretical and clinical framework: it helps us understand what we are measuring, why we are measuring it, and what we want to achieve through training. The goal is not "calming at any cost" — but restoring the flexibility of the nervous system.

Who is biofeedback and neurofeedback suitable for?

These methods have a wide range of applications. They can be used in the context of:

• Chronic stress and burnout — restoring the regulatory capacity of the nervous system
• Anxiety and panic attacks — training physiological downregulation
• Traumatic experiences — somatic stabilisation before or alongside therapy
• Attention disorders (ADD/ADHD) — neurofeedback as training in cortical activation regulation
• Sleep difficulties — working with autonomic arousal and brain activity patterns
• Performance biofeedback — for athletes, musicians, and people preparing for high-demand situations
• Autism spectrum — sensory and autonomic regulation

Biofeedback is not therapy in the conventional sense — it is training. We work with physiology, not with content. This is precisely why I see it as a valuable complement to psychotherapeutic work: a client may learn to understand their stress verbally, but biofeedback helps them feel and change it physically.

What does a session look like in practice?

A session begins with placing the sensors — most commonly we measure breath, skin conductance, heart activity, and muscle activity. The first part is diagnostic, and we identify what is known as the client's stress profile: we observe how the body responds to rest, to challenge, to conversation. This profile gives us a picture of where the regulatory reserves lie and where the limits are.

In the training phase, the client receives real-time feedback — most often visual or auditory. They learn, for example, to slow their breathing until they find their resonance frequency — the rhythm at which the heart and breath work in harmony and HRV reaches its peak. This state is the physiological expression of ventral vagal activation.

The changes are measurable. And for many clients — visible. Seeing your own physiology on a screen and knowing you can influence it is a powerful experience — one that carries therapeutic value in itself.