Walk through the load-bearing claim of TMoP: the architecture, the magnetic-circuit parameters, the developmental construction of the coil, and the configurations that produce specific HiTOP profiles.
That's the whole claim. Everything else in this explainer is a consequence of it.
The brain is a coil.
The mind is the field it generates.
The brain is a coiled biological structure, built turn by turn over your lifetime. When activity runs through it, a field forms around it. That field is the mind.
The mind is not a thing inside your skull. It is the shape made by what your brain is doing. Take the brain away and the field stops. Restart the brain (sleep, recovery, medication, therapy) and the field re-forms.
Two anchor terms. The top of the coil is where the system acts on the world. The bottom is where the world comes back in.
Scroll to walk through the model. The shape on the right will rotate and re-annotate to match each chapter. Drag it any time to look from another angle.
The coil is not finished at birth. It gets built across eight stages of life. Each stage adds another turn. Whatever happens at one stage becomes the foundation for every stage that comes after.
The basic wiring is laid down inside the womb. Stress in pregnancy, infection, or toxin exposure can leave a faint kink in the coil that shows up decades later.
The brain is doubling its connections. The baby borrows a parent's nervous system to learn how to settle. Neglect at this stage is the deepest wound there is.
Connections that get used get strengthened. Connections that don't get pruned. Language opens. Whatever is learned here goes deep, fast.
Schools take over from caregivers. Self-worth starts forming around competence and peer approval. The coil settles into recognisable shape.
Hormones reorganise everything. Identity gets rebuilt from the inside out. This is when most major mental illnesses first appear.
The prefrontal cortex finally finishes maturing around age 25. Career, intimacy, the long projects of life take shape.
The brain trades raw speed for accumulated wisdom. The coil is at its most stable but no longer growing.
Slow decline of tissue. What survives is meaning. The arc closes.
When we talk about a "general vulnerability" to mental illness (the so-called p-factor), this is what we mean: the cumulative quality of the coil. A bad early turn shows up across the rest of life as a higher risk for almost everything.
Every time you speak, move, reach, or try to influence the world, the field is firing outward from the top end of your brain coil. We call this end the N pole.
What sits at this end is the part of you that tries. It generates intentions, plans, sentences, gestures. Every sentence you say is a small experiment. Every reach for a doorknob is a small prediction.
This end has two layers. The deeper layer is raw drive: the urge to act, to speak, to push out. The surface layer shapes that drive into something coherent: sequencing, filtering, holding back when needed.
This is what ADHD looks like in TMoP terms: the drive layer is fine, the shaping layer is immature. The urge to do is fully there. What's missing is the part that decides which urge, in what order, with how much.
Every time you hear, see, taste, or notice your own heartbeat, signals are entering your brain coil from below. We call this end the S pole.
This end is the part of you that receives. It is also where you build the sense of being a self. Most people don't realise this, but the feeling of being you is something your brain has to keep making, every second, by paying attention to what's coming back from your body and from the world.
Like the top, the bottom has two layers. The deeper layer just registers the raw signal: a sound is a sound, a heartbeat is a heartbeat. The surface layer makes meaning of it: what the sound is, whether the heartbeat is a danger sign, what it all means about you.
This is what PTSD looks like in TMoP terms: the take-in layer is fine, often too fine. Every threat signal lands hard. What fails is the meaning-making layer. The signal arrives but cannot be metabolised. It just sits there, vivid and unprocessed.
When the bottom of the coil is too blocked to take things in, the sense of being a self becomes thin. The person feels empty, numb, unreal. Not because they lack feeling, but because their brain cannot keep the sense of self in good supply.
When activity runs through the coil, a field forms around it. Picture a fountain. Water shoots out from the top, arcs through the air, falls back to the basin at the bottom, then loops back up through the inside to start over. The mind has the same shape. Every line of activity goes out from the top, loops around through the world, comes back in at the bottom, then runs up through the inside of the coil to begin again.
Every line is a closed loop. None of them just "fly off." The field has nowhere else to go.
Every line of mental activity must close on itself. There is nowhere for it to disappear to.
The mind, in this model, is the whole pattern of these loops circulating around the coil. As long as activity flows in the brain, the field forms. Stop the flow and the field stops too. That is what unconsciousness, deep sleep, and death look like from the field's point of view.
A healthy mind does not need constant outside reassurance to feel like itself. The field circulates on its own. Out the top, around through the world, in at the bottom, back up through the brain. The continuous feeling of being you is this circulation.
The fountain isn't one single arc. There are many arcs, at different distances from the coil. Some loop close, hugging the body. Others reach far out into the world. Together they form a shape that, viewed from the side, looks like a pumpkin. Dense and clear at the centre. Fading to almost invisible at the edges.
Inside arcs are what you've already learned. They're tight, fast, automatic. You don't think about them. They've become part of who you are.
Outside arcs are what you're still reaching toward. They're loose, slow, uncertain. They're what you don't yet understand but are trying to.
This depth also tracks with time. Inner arcs are usually older. They were built early, when you were small, close to your body, close to the people who raised you. Outer arcs are newer. Things you're learning now, things you haven't yet metabolised. The pumpkin is, in a way, a map of your own history.
If the inside loop gets blocked, the field can't complete itself the normal way. It has to find another route. That's what externalising looks like, and we will come back to it in Chapter 09.
Each loop in the field has two halves. The outside half goes through the world. The inside half goes through the inside of your own coil. They are not two separate things. They are two halves of one circulation.
A healthy mind has both halves working. When one breaks down, the other tries to compensate, but at a cost.
Too much outside half without inside half: restless action without inner reference. The kind of person who can't stop doing but never feels grounded.
Too much inside half without outside half: rumination without contact. Loops of thought that have lost their connection to anything real.
There is one equation underneath the whole model. It says: the strength of your mental field is equal to your drive divided by your resistance.
Drive itself is two things multiplied. How well-built your coil is (call this μ, your tissue quality) times how much energy is flowing through it right now (call this I, your moment-to-moment state). Both have to be high for the field to be strong.
The field can be weak for three different reasons. The block can be at the top of the coil, in the world outside, or at the bottom of the coil. Three different bottlenecks. Each one needs a different fix.
This is the clinical payoff. Two patients can look equally depleted but for very different reasons. One needs help getting started (top block). One needs a different environment (world block). One needs help feeling their body again (bottom block). Same total weakness. Three completely different treatments.
Imagine a wedding ring with a tiny notch cut in it. The notch is small. But it changes how the whole ring behaves. The same thing happens in a brain coil. A bad early experience leaves a gap in one of the eight turns. The gap is small, but the field has to flow around it, and that single gap can dominate the whole circuit.
This is what early trauma does. A child who didn't get language input during the window when language is supposed to come in. A child whose attachment to a caregiver was broken before age two. A child exposed to chronic stress before the brain finishes its early consolidation. These leave gaps that don't go away. The rest of the coil compensates as best it can, but the gap is permanent.
This is also why the same dose of childhood adversity can produce wildly different adult outcomes. The gap is small in size but huge in effect. Whether it dominates depends on which turn it sat in and how the rest of the coil was wound.
There's a law of physics: a field line cannot just stop in space. It has to come back to where it started. So when the inside path of the loop is blocked, the field doesn't disappear. It finds another route. It reaches into the world for whatever it can use to complete itself.
This is what externalising looks like in TMoP terms. Anxious reassurance-seeking. Substance use. Controlling other people. Compulsive contact. Picking fights. The inside loop has failed, and the field is borrowing the world to complete itself.
Externalising is not a moral failure. It is a field looking for a way to close itself.
This is one of the parts of the model that changes how you look at clinical work. Behaviours that look intentional or manipulative may be the visible signature of a field that has lost its internal route. The therapeutic question stops being "how do we stop this behaviour?" and becomes "where is the inside path broken, and can it be restored?"
Imagine your model of the world drifting slowly out of sync with the actual world. At first you don't notice. The drift is small. Then it grows. Then it gets so big that updating your model is more "expensive" than just keeping the wrong one. Then the system locks. You believe something that isn't true and you cannot update.
That's how delusions form. They aren't random. They are the endpoint of a slow drift that accumulated, invisibly, for months.
The trigger for the lock isn't usually the wrong belief itself. It's something that drains the system's energy. A sleep crash. A withdrawal. A flu. A serious illness. That's why people often have their first psychotic break during physical stress, not during emotional stress.
The drift was already there. The energy drop is what fires the lock.
This explains a clinical pattern that looks mysterious from outside: the prodromal patient who seems "fine, just a bit off" for months, then crashes into full psychosis during a flu or after pulling several all-nighters. The model has been drifting for a long time. The acute illness drops the energy that was holding the loose prior in place. Below threshold, the system locks.
In this model, the major patterns of mental illness are not separate diseases. They are different patterns of strength and weakness in the same circuit. Click any one to see how the field reshapes.
What this view buys clinically: the same diagnosis on paper can have very different field shapes underneath. The "depressed" patient who is paralysed by inhibition is not the same as the one who is drowning in environmental adversity is not the same as the one who has gone numb to their own body. They look similar on a checklist. They need different things.
Brain is a coil. Mind is the field around it. Field has two halves: outside (engagement with the world) and inside (engagement with yourself). The field can get blocked at three places: at the top of the coil, in the world, at the bottom of the coil. The coil is built across eight stages of life, and gaps in any stage affect the whole rest. When the inside loop fails, the field has to find another way to close itself. That's externalising. When your model of the world drifts too far from the actual world and your energy crashes, the system locks. That's psychosis.
What you can do with this:
Two patients with the same label can have very different field shapes underneath. Treat the field, not the label.
If the field is weak, ask which bottleneck. Top, world, or bottom. Different treatment for each.
Reaching outside is what happens when the inside loop breaks. The clinical question becomes: where is the gap?
Why: slow drift in the model. When: an energy crash that drops the system below threshold.
The model is not a literal claim that the brain runs on magnetism. It is a structural claim: the math of magnetic circuits and the math of how brains update their predictions share a formal shape that may turn out to be the same shape underneath. The model earns its keep, or doesn't, on whether its testable predictions hold. The most central one: whether the top and bottom of the coil can be measured separately as two distinct biomarker factors in a large transdiagnostic study. That study is the next piece of work.