One conscious breath · eight stages

The Breathing Brain

Get out of the thinking brain and into the breathing brain. Explore the overlapping networks behind that shift of attention: where a breath is noticed, where it is chosen, how the command reaches the diaphragm, how the body reports back, and how one breath changes the state of the whole system.

How to read it. Press play and watch one complete conscious breath. The brain is a real human cortex; the regions that carry each stage come into view on the surface itself. Beside it, a teaching illustration breathes on its own, slowly and continuously. Click a stage to repeat it; choose Full sequence to continue, or pick a pattern in the Spirogram below. Mint routes are commands, brain → body. Lilac routes are information, body → brain. Click any structure to identify it.
Brain
Hemispheres||
Cortex22%
Loading the surface
drag · scroll · click to identify
commandinformation
Body 6·2·6·1
Highlighted pathways illustrate participation — not measured brain activity or blood flow. Atlas surface · schematic nuclei · illustrative routes · simulated physiology are drawn differently and mean different things.
Click a brain area, a nucleus, the lungs, the heart or the diaphragm to identify it

What you experience

What your body does

What your brain does

What it means

Full neural pathway
See the breath

Spirogram

Nine breathing patterns and how they change the respiratory cycle. Choose one and it repeats here continuously while the stages it uses light up in the brain above. The trace is drawn against textbook lung volumes; everything here is an illustrative model, not a measurement.

Breathwork involving high ventilation or breath retention can cause fainting. Do not practise it in water, while driving, or anywhere a loss of consciousness could cause injury. Hold length is not a competition, and dizziness is not a goal.

Illustrative lung-volume trace last 40 s · litres · model, not spirometry

Volumes used · TV 0.5 L + IRV 3.1 L + ERV 1.2 L + RV 1.2 L = TLC 6.0 L · FRC 2.4 L · VC 4.8 L. Textbook adult values; yours will differ. The axis starts at zero so the residual volume is shown, not implied; ordinary spirometry cannot measure RV, FRC or TLC directly.

Rate · from the pattern
12/min
Heart rate · simulated
62bpm
CO₂ · simulated
40mmHg
Rate is counted from the programmed cycle. Heart rate and CO₂ come from a simple illustrative model (CO₂ follows ventilation relative to a fixed metabolic rate; heart rate follows a modelled autonomic state and breathing phase). They show expected tendencies, not anyone’s physiology.
Expected tendency
The science underneath

The networks behind the eight stages

What the brain and brainstem are doing while you breathe, one line per step. The stage playing above lights the steps it draws on.

Conscious breathing is a cortical–brainstem–autonomic loop that gives intention access to an otherwise automatic control system.

The brainstem never hands over the keys. What the cortex gets is a seat at the table: the supplementary motor area and M1 can drive the phrenic motor neurons directly, and the insula and cingulate can read what came back. Run the loop enough times and the prediction improves; then the cortex can step out again, and the breath you left behind is different from the one you found.

Full pathways · automatic control and conscious processing
The thinking behind the website · Justin Ternes, DPT

Give attention somewhere else to go

I teach breathwork, and while I’m teaching, I often visualize the neurology of the breath—the intention to move, the movement itself, the sensations returning from the body, and the ongoing conversation between brain and body.

I created THE BREATHING BRAIN to make that inner picture visible.

My goal is to help busy-minded people move from being absorbed in thought toward breathing, moving, feeling, and being present. Instead of asking the mind to stop thinking, I give attention somewhere purposeful to go.

People in my classes often describe a clear or quiet mind afterward. My working hypothesis is that an engaging physical and sensory task can make mental chatter less dominant in their experience. That does not require the thinking brain to shut off.

The brain may be differently engaged—and the person may feel more present.

Why breath · Justin Ternes, DPT

Out of the thinking brain, into the breathing brain

The phrase is a teaching lens, not a map of separate organs. It names a shift in what attention is occupied by, and you can feel it happen.

Presence

Where the deeper human experience lives

The thinking brain, as I use the phrase, is the prefrontal network running its predictions: what happened, what might happen, what it means. It is useful and it is loud. The breathing brain is older and quieter: the brainstem rhythm, the insula reading the body, the cingulate weighing how much attention this moment deserves. These are overlapping functions, not five separate systems, and the prefrontal cortex does not switch off when you breathe on purpose. When you move attention onto the breath, you move it from the story to the signal.

That is where presence lives. Mindfulness, focus under pressure, the states people describe as flow or as spiritual: in my experience they share a family resemblance. The thinking brain has stepped back, the breathing brain has come forward, and the whole system is being felt rather than narrated. Whether they share a mechanism is an open question; the research points to distributed, task-dependent networks rather than one universal sequence. What I can say from the room is that a demanding, sensory task gives the mind somewhere else to be.

Movement

Your breath at rest is not your breath with purpose

I came to breathwork through physical therapy, so I see a breath as a movement first. At rest the diaphragm does almost all of it: a small descent, about half a litre of air, the ribs barely involved. That breath is efficient and it is supposed to be unconscious.

A breath taken on purpose is a different movement. The ribs swing up and out on two axes, the sternum lifts, the spine lengthens, the diaphragm travels much farther than it does at rest and the belly makes room for it. How far varies from person to person. The reserve volumes are defined against an ordinary tidal breath: inhaling beyond it uses the inspiratory reserve, exhaling past the usual stopping point uses the expiratory reserve, and a second small inhale can add air only if the first one did not already reach true full. Practising both ends makes you more skilled at using the range you have; it does not, by itself, show that the lungs get bigger. Breathwork is mobility work for the thorax, with a nervous system attached.

Breath is an unusually accessible interface between voluntary action and automatic regulation.Heart rate · blood pressure · cardiac vagal activity · cerebrospinal fluid · arousal · affect · attention
Nervous system

Breath sets the state

The nucleus of the solitary tract in the medulla is where the breath's vagal sensory report lands, and it sits next door to the nuclei that regulate the heart. Slow, long-exhale breathing tends to increase the respiratory swing in heart rate and is often experienced as settling; fast, deep breathing tends to raise sympathetic drive and alertness, and lowers CO₂ when ventilation outruns metabolism. High-ventilation practices use the second lever and then let the system return; a larger heart-rate swing during slow breathing is not the same thing as a higher baseline vagal tone. Breathing near six per minute is where respiration and the baroreflex interact most strongly.

The heart feels every breath. Heart rate rises a little during inspiration and falls during expiration, respiratory sinus arrhythmia, mainly because the breath modulates the vagal braking on the heart; the pressure changes in the chest and reflex influences add to it. Blood pressure sways a few millimetres of mercury with each cycle. Both phases take part. These are not side effects; they are part of how the breath and the rest of the body talk to each other.

Fluid

Cerebrospinal fluid moves with the breath

Real-time MRI shows that a deep inhalation is a dominant driver of cerebrospinal fluid movement up the spinal canal and into the head, larger than the cardiac pulse. The same drop in chest pressure that fills the heart draws venous blood out of the skull, and CSF follows. A deep, slow breath moves the fluid that bathes the brain. Whether that improves clearance, or contributes to how a deep breath feels, has not been shown; the imaging measured movement, not those outcomes.

None of this requires belief. It requires a diaphragm, a few minutes, and attention. The model above is here so you can see the wiring while you feel it, drawn as teaching routes rather than measurements.