The methodology behind 3 Brains Intelligence
You are not one decision-maker. You are three. Your Head reasons. Your Heart values and connects. Your Gut acts and protects. Each one is a functional neural network with its own neurons, its own memory, and its own agenda. When the three move in the same direction, decisions are clear and change holds. When they disagree, the loop most people know too well begins — why didn't I think of that, why didn't I follow my heart, why didn't I trust my gut. This page explains the neuroscience that underwrites that experience, the methodology that turns it into something workable, and how 3 Brains Intelligence sits in relation to the other major theories of human intelligence and emotion.
ON THIS PAGE
THE FOUNDING OBSERVATION
The question behind the method
If knowing was enough, the man with the tunnel phobia would already have been free.
In 2005, after a long career in international business and a recovery from burnout that took Christoffel through clinical training in hypnotherapy, psychotherapy, NLP, somatic work and haptonomy, a CEO in the Netherlands arrived in his office with a tunnel phobia that nothing cognitive had touched. The client knew, in his head, that the tunnel was safe. He could draw the engineering. He could quote the accident statistics. He still could not drive through it.
Clinical observation
That session opened a question that became the methodology. If knowing was enough, this man would already have been free. He was not free because the part of him that was holding the fear was not the part that knew the statistics. Cognitive intervention reaches one brain. The fear was being held by the other two.
The question, refined across two decades of practice and more than 4,650 documented assessments, became this. If a human being has three distinct neural networks, each with its own intelligence and its own protective patterns, then any methodology that addresses only one of them will produce temporary change at best. Lasting change requires the three to be heard, integrated, and brought into alignment.
THE SCIENCE ACCUMULATED
A brief history of how we got here
The science behind 3 Brains Intelligence did not appear in one moment. It accumulated across a hundred and sixty years of work, and the methodology assembled it into a single usable map.
Claude Bernard, in 1865, wrote that the heart is a centre influenced by all sensory inputs. Charles Darwin, in 1872, observed that excitement produces mutual action between the heart and the brain through what he called the pneumo-gastric nerve — the structure we now call the vagus. ESTABLISHED Both observed clinically what neuroscience would later confirm: the heart and the head talk to each other constantly.
In the mid-twentieth century, Paul MacLean proposed the triune brain, a layered evolutionary model of reptilian, limbic and neocortical structures. Established as a model Around the same time, Russian neurologist Paul Yakovlev described the gut, brainstem, limbic and cortical systems as overlapping, integrated, mutually evolved. The seed of we are not one brain was already planted, even if popular psychology stayed with the single-cognitive-mind picture.
Neurocardiologist J. Andrew Armour confirmed the Heart Brain in 1991 and published Neurocardiology through Oxford University Press in 1994, defining the heart's intrinsic nervous system as a functional neural network capable of sensing, learning and remembering independently of the brain in the skull. Established Seven years later, in 1998, neurobiologist Michael Gershon published The Second Brain with HarperCollins, describing the enteric nervous system in the gut as a fully functional neural network of approximately 500 million neurons, capable of operating without instruction from the head. Established
Antonio Damasio, in Descartes' Error (1994), demonstrated through the somatic marker hypothesis that emotional and physiological signals tag decisions before logical reasoning takes place. Established Bessel van der Kolk, in The Body Keeps the Score and the foundational 1994 Harvard Review of Psychiatry paper, made it clinically unavoidable that memory of significant experience is held in the body, not only in the cortex. Established Peter Levine, through Somatic Experiencing, showed that unresolved trauma is stored as incomplete physiological responses and can be discharged at the body level. Emerging, clinically robust Daniel Siegel, in Mindsight, formalised interpersonal neurobiology and the role of integration across neural networks. Established The HeartMath Institute, through Rollin McCraty and colleagues, documented the electromagnetic and informational communication between heart and brain, including evidence of intuitive pre-stimulus responses in the cardiovascular system. Emerging Lisa Feldman Barrett, in Seven and a Half Lessons About the Brain, reframed the brain as predictive rather than reactive, which dovetails directly with how 3 Brains Intelligence describes the body as deciding before the cortex narrates. Established
Within the same period, Grant Soosalu and Marvin Oka brought the multiple-brain conversation into applied practice through their mBraining work and compiled a literature base of more than six hundred peer-reviewed and applied references across the field, covering Heart Brain, Gut Brain, anterior cingulate cortex, autonomic nervous system, interoception, intuition, and the integration of the three. Established compilation Their reference base is itself a substantial contribution to the field, gathering work that had been scattered across neurology, gastroenterology, cardiology, psychology and consciousness research, and making it visible as a single landscape. 3 Brains Intelligence stands on this landscape and the lineage that fed into it.
Supporting research that strengthens the picture without being core to the original anchors: Candace Pert's Molecules of Emotion (1997) on neuropeptide signalling across the body Established for the receptor biology , and Bud Craig's work on interoception (How Do You Feel?, 2002, 2005, 2009) defining the neural basis for the felt sense of the body's internal state. Established
The 3 Brains Intelligence methodology does one thing the lineage has not yet done. It assembles the science into a working language, a diagnostic, and a coaching method, so that the integration is no longer the intuition of the most gifted clinicians, but a structured practice anyone trained in it can deliver.
CURRENT SCIENCE
Where neuroscience stands today
Three confirmed neural networks. One autonomic highway between them. And a measurable metacognitive layer in each one that current research has begun to make visible.
The question behind the method
In 1991, J. Andrew Armour described the heart's intrinsic nervous system, since called the Heart Brain. Established This network contains specialised neurons and supporting cells that sense, process and transmit information in patterns analogous to neurons in the head. Estimates of the cell count vary by what is being counted. Christoffel's reference (Armour, Neurocardiology, Oxford 1994) cites approximately 40,000 specialised neurons. HeartMath publications, counting glial and supporting cells, sometimes cite figures up to 100,000. The biology is undisputed even where the count is approximate.
The Heart Brain evaluates emotional truth, relational safety, fairness, belonging and meaning. It is also the source of one human capacity that is routinely misattributed in popular psychology and even in coaching literature: courage. Courage is commonly described as a Gut Brain function, as in you need the guts to do it. The biology does not support that. The Gut Brain's anger and rage are focused on self-preservation. The Gut alone is not capable of self-sacrifice. True courage is the conscious decision to risk pain, peril or even loss to protect or preserve something more precious than your own safety, and the only brain capable of that calculation is the Heart. The Gut provides power. The Heart provides purpose. Grounded courage is what emerges when the Heart says this matters and the Gut answers then let's go.
Methodology distinction, set out in Relationships? Which Brain Is Talking? and Break Free to Thrive
Courage isn't in the Gut. The Gut provides power, not purpose. True courage lives in the Heart.
Heart-transplant research has documented a small but consistent percentage of recipients reporting preference, taste or emotional changes that mirror their donors Emerging (Pearsall, Schwartz and Russek, 2002), which is consistent with the Heart Brain carrying functional cellular memory. That memory is stored without a time stamp. The Heart does not register this happened in 1997. It registers this is what rejection feels like, which is part of why heartbreak from twenty years ago can still feel current in the body when the right cue arrives.
A separate line of work reinforces how directly the Heart Brain participates in social and stress regulation at the level of hormones. Gutkowska, Jankowski, Mukaddam-Daher and McCann (Brazilian Journal of Medical and Biological Research, 2000) demonstrated that the heart itself synthesises oxytocin, expresses oxytocin receptors in all four heart chambers and large vessels, and releases atrial natriuretic peptide in response to oxytocin binding — slowing the heart and producing vasorelaxation. Established Grewen and Light (Biological Psychology, 2011) showed in postpartum women that higher plasma oxytocin correlated with smaller vasoconstriction during acute stressors, lower plasma norepinephrine, and what the authors described as an anti-stress response that limits cardiovascular departures from homeostasis. Established The same hormone associated with maternal bonding, partner affection and social trust is, biologically, a cardiac hormone that the heart itself produces and that the heart's own receptors respond to. The Heart Brain's involvement in connection, belonging and felt safety is not metaphor.
The Gut Brain
In 1998, Michael Gershon described the enteric nervous system in The Second Brain. Established Approximately 500 million neurons line the gastrointestinal tract, sending and receiving signals through the chest, torso and innervated organs. The Gut Brain produces over ninety percent of the body's serotonin, alongside dopamine, GABA, cortisol, adrenaline, noradrenaline and other neurotransmitters identical to those of the Head Brain. It operates with relative autonomy and is the system that scans for safety, threat and timing in milliseconds, long before the Head can form language. Like the Heart, the Gut has no time register. A survival signal stored in childhood remains now until the system that stored it is reached. Collins and Bercik (Gastroenterology, 2009) extended the picture with the role of intestinal microbiota in central nervous system function. Established
The Gut Brain's role goes beyond safety and threat. Han, Tellez, Perkins, Shammah-Lagnado, de Lartigue and de Araujo (Cell, 2018) identified a gut-to-brain neural circuit through the right branch of the vagus nerve that drives reward and motivation, with optical activation of right-vagal sensory ganglia inducing dopamine release from the substantia nigra and sustaining self-stimulation behaviour. Established The same study showed that the right and left vagal branches ascend asymmetrically into the central nervous system, with only the right branch contacting dopamine-containing reward neurons. This places the Gut Brain not just at the safety and survival end of the system, but inside the brain's reward circuit at a structural level, which is consistent with what coaches and clinicians have long observed: a client whose Gut is shut down does not only feel unsafe — they also feel unmotivated, joyless and disconnected from drive.
The Head Brain
The Head Brain contains approximately 86 billion neurons Established It handles language, abstract reasoning, prediction, planning and cause-and-effect analysis. It is the slowest of the three to decide, because it works through symbolic representation rather than direct sensing. It is also the brain coaching, psychology and education have historically named first, and the brain most clients arrive trying to lead with.
There is one capacity unique to the Head Brain that the rest of the methodology depends on: the perception of time. The Head is the only one of the three brains that has a register for past, present and future. It can remember what happened last year. It can plan for next month. It can run cause-and-effect across decades. The Heart Brain and the Gut Brain do not have a time concept. They live entirely in the now.
Established · Methodology distinction set out in Relationships? Which Brain Is Talking? and the Coach Certification Manual
This asymmetry is consistent with the Cognitive Trade-off Hypothesis (Tetsuro Matsuzawa, Kyoto University Primate Research Institute), which proposes that humans developed time-related memory and language through the neocortex as a survival adaptation when our ancestors moved from forest to open fields. We gained the future and the past. We lost the extreme short-term memory chimpanzees still have. Emerging, well-supported Animals always live in the present. Your pet does not worry about Tuesday. They also do not get ulcers from things that happened last year.
The clinical implication of this asymmetry is one of the most important teachings in the methodology, and it explains a question every therapist and coach eventually meets: why does PTSD persist when the person knows the trauma is in the past? Because the part of them that knows it is in the past is the Head Brain. The Heart Brain and Gut Brain that stored the trauma do not have a past tense. They experience the stored event as happening now. Cognitive intervention reaches the Head. The trauma is being held by the brains that do not know what year it is. This is why purely cognitive approaches to deep trauma plateau. The Head can know everything, and the body still flinches.
Methodology distinction, integrated with established trauma research (van der Kolk, Levine)
Your Heart and Gut don't know what year it is. That is why knowing the trauma is over isn't enough.
How the three communicate
The autonomic nervous system is the highway between the three brains. Established Vagal afferents carry significantly more information upward from heart and gut than they carry downward, a structural fact that underwrites Damasio's somatic marker hypothesis and Barrett's predictive-brain account. The body tags reality before thought. The cortex organises afterwards. Van Veen and colleagues (Nature Neuroscience, 2009) provided direct neural evidence that the anterior cingulate cortex tracks the internal conflict between competing decision systems. Established Appelhans and Luecken (Review of General Psychology, 2006) showed heart rate variability indexes regulated emotional responding, supporting the cardiac coherence claim. Established
Stephen Porges's Polyvagal Theory has been influential in trauma and somatic work, naming dorsal vagal, ventral vagal and sympathetic states as the architecture of social engagement and defence. Contested mechanism, clinically influential Christoffel's published position, set out in Relationships? Which Brain Is Talking?, is that the specific tri-vagal mechanism Porges proposes is not supported by current vagal anatomy, while the broader observation that the autonomic nervous system shapes engagement, threat and recovery is sound. That position is now backed by a substantial peer-reviewed critique. Liem and Neuhuber, writing in the Deutsche Zeitschrift für Osteopathie in 2021 (translation by Paul Grossman and Winfried Neuhuber), set out three problems with the Polyvagal account. First, comparative anatomy contradicts its phylogenetic basis. Cartilaginous fish such as sharks, which have existed for 400 million years, already have myelinated cardioinhibitory vagus neurons originating in two separate brainstem sites — the dorsal vagal nucleus and the primordium of the nucleus ambiguus — which means they are already polyvagal in Porges's sense. Second, the nucleus ambiguus does not in fact control facial expression (which is innervated by the facial nucleus) or hearing via the middle ear muscles (innervated by the trigeminal and facial nerves), so the claimed face-heart coupling does not anatomically exist as described. Third, behavioural states such as fight, flight, freeze and risk assessment are actually coordinated by the mesencephalic periaqueductal gray (PAG) in the midbrain, not by a vagal pathway. The conclusion the authors reach is direct: the social engagement concept is plausible and useful, but linking it to the polyvagal label is, in their words, a misleading misnomer. 3 Brains Intelligence does not depend on Polyvagal's specific mechanism. It works directly with the three neural networks Armour and Gershon described and the autonomic highway between them.
Benjamin Libet's readiness potential research, in which measurable neural activity precedes the conscious decision by several hundred milliseconds, is consistent with the same picture.Established The decision is in motion before the Head narrates it. The Head's job is integration, not initiation.
Metacognition and the gap 3 Brains Intelligence fills
Two researchers in current neuroscience have done some of the most rigorous work on what cognitive scientists call metacognition — the ability to know what you know. Their findings, read together, point at exactly the gap this methodology fills.
Stephen Fleming, with Rimona Weil, Zoltan Nagy, Raymond Dolan and Geraint Rees, published Relating Introspective Accuracy to Individual Differences in Brain Structure in Science in 2010. Established The paper showed that the accuracy of a person's introspection varies measurably between individuals and correlates with anatomical features of the prefrontal cortex. That is the metacognitive layer of the Head Brain made empirical.
Sarah Garfinkel, with Anil Seth, Adam Barrett, Keisuke Suzuki and Hugo Critchley, published Knowing Your Own Heart: Distinguishing Interoceptive Accuracy From Interoceptive Awareness in Biological Psychology in 2015. Established Her three-dimensional model separated objective interoceptive accuracy (can you actually detect your heartbeat) from subjective sensibility (do you think you are tuned in to your body) and metacognitive awareness (does your confidence match your accuracy). That third dimension is the metacognitive layer of the Heart Brain made empirical. Her later work has shown that this awareness degrades under threat and recovers under safety, which maps directly onto how the methodology describes the Heart Brain: it needs to feel safe before it can open.
A question Fleming's lab discussed for years and never resolved cleanly was whether metacognition is one unified capacity or domain-specific. The 3 Brains framework suggests the resolution. Each brain has its own metacognitive layer, dissociable from the others. Head metacognition is the awareness of your reasoning. Heart metacognition is what Garfinkel measures, the awareness of your emotional and cardiac state. Gut metacognition is the accuracy of your reading of safety, danger, timing and power dynamics, and as of today there is no peer-reviewed instrument that measures it. Emerging, proposed Whole-system metacognition then becomes a fourth capacity, qualitatively different from the sum of the three, which only emerges when all three are operating in alignment.
This is the specific scientific gap 3 Brains Intelligence occupies. The science has been circling the integration without assembling it. The methodology assembles it.
WHERE IT FITS
How 3 Brains Intelligence relates to other theories
Four frameworks come to mind for any informed reader. The methodology sits in a clear relation to each of them, and the relation is not opposition.
Howard Gardner's Multiple Intelligences
Howard Gardner's theory, set out in Frames of Mind (1983), proposes that human intelligence is plural rather than unitary, naming linguistic, logical-mathematical, spatial, musical, bodily-kinesthetic, interpersonal, intrapersonal and later existential and naturalistic intelligences. Gardner is talking about the content domains in which a person can be intelligent. He is asking what kinds of problems a person is good at solving. 3 Brains Intelligence is asking a different question. It is not a taxonomy of skills. It is a description of the biological decision system that all of those intelligences run on. Whatever Gardner-style intelligence you are using to solve a problem, your Head, Heart and Gut still need to agree before the decision moves into action. The two frameworks are not in conflict. Gardner explains what you are good at. 3 Brains Intelligence explains how the decision to use it gets made.
Paul MacLean's Triune Brain
Paul MacLean's triune brain model, developed across the 1960s and popularised in The Triune Brain in Evolution (1990), described three evolutionarily layered systems: a reptilian complex governing survival, a paleomammalian limbic system governing emotion, and a neomammalian neocortex governing reasoning. Modern neuroscience has substantially revised MacLean's evolutionary claims. The brain did not assemble itself in clean reptile, mammal, primate layers. Established revision What MacLean got right, and what 3 Brains Intelligence builds on directly, is that humans operate through more than one decision system, and these systems can disagree. Where MacLean located all three inside the head as evolutionary strata, 3 Brains Intelligence locates them as three anatomically distinct neural networks in the head, the heart and the gut. The shift is from layers inside one organ to networks across three organs. The implications for coaching are concrete. You cannot reach the Gut by talking to the cortex.
Daniel Goleman's Emotional Intelligence
Daniel Goleman's Emotional Intelligence (1995) transformed how the world talked about the workplace, naming self-awareness, self-regulation, motivation, empathy and social skill as competencies of equal weight to cognitive ability. The contribution is enormous and 3 Brains Intelligence acknowledges it openly. What Goleman named EQ is, in the language of this methodology, predominantly the Heart Brain in action. The skills he identified are the trainable surface of one of the three networks. 3 Brains Intelligence extends Goleman's insight in two directions. First, it grounds the Heart Brain in the specific neuroscience Armour and HeartMath have documented, rather than treating it as a metaphor for emotion. Second, it places the Heart Brain alongside the Head Brain and the Gut Brain as three peers in a decision system, rather than as one capacity that can be added to a cognitive default. Goleman opened the door. 3 Brains Intelligence walks through it and maps the room.
Soosalu and Oka's mBraining
mBraining, developed by Grant Soosalu and Marvin Oka and set out in their 2012 book of the same name, is the framework most closely adjacent to 3 Brains Intelligence in the field. Both work with the same underlying neuroscience of Head, Heart and Gut as three functional neural networks. Both reject the single-cognitive-mind picture of human decision-making. The contribution Soosalu and Oka made to the field is substantial, including the literature base of more than six hundred references their work assembled. 3 Brains Intelligence acknowledges the lineage openly. Where the two frameworks differ is in what was built on top of the shared foundation. 3 Brains Intelligence adds the 12 Protectors Model, a diagnostic of the four protective patterns each brain produces under stress, together with the Dominance Test and the 12 Protectors Test as structured assessments. It is built around an ICF-accredited 40-CCEU coach certification with EMCC and NOBCO recognition, and it is grounded in a clinical practice that integrates hypnotherapy, psychotherapy, NLP, somatic work and haptonomy. The two frameworks are not in opposition. They are best understood as complementary developments of a shared insight, with 3 Brains Intelligence representing the next decade of clinical and coaching application built on top of the foundation Soosalu and Oka helped establish.
THE ARCHITECTURE
The three brains as a decision system
The three brains do not vote democratically. They operate in a survival hierarchy.
Established for Gut-first response timing Clinical observation for the full hierarchy
The Gut Brain decides first, on a timescale of milliseconds, because its job is to keep you alive. The Heart Brain follows, on a timescale that allows for relational and value-based weighting. The Head Brain arrives last, with language, justification and a story.
When all three are aligned, the sequence is invisible and the decision feels clear, fast and yours. When the Gut says no and the Head says yes, the body holds the answer regardless of what the cortex argues for. This is why people who logically know what they should do often do not do it. They are not weak. Their biology is not on board.
Your Head cannot solve what your Heart and Gut have not agreed on.
THE OUTCOME
What alignment delivers
When the three brains move in the same direction, several things change that are concrete enough to recognise.
Decisions stop costing what they used to cost. The internal argument shortens. The post-decision loop, the one that sounds like why didn't I think of that earlier, why didn't I follow my heart, why didn't I trust my gut, falls quiet because all three were heard before the choice was made.
Change that previously required willpower starts to require less of it, because the part of you that was opposing the change has been brought into the conversation rather than overridden. Self-trust returns, not as a feeling cultivated through affirmation, but as the natural consequence of acting consistently with what your full system actually wants.
Burnout patterns soften because the Heart is no longer being asked to override the Gut's no, and the Head is no longer being asked to police a war between the other two.
Clinical observation, n = 4,650+ assessments, 300+ certified coaches' client work These are the outcomes the methodology is designed to produce.
THE STAKE
What excessive dominance of one brain costs
The reverse case matters as much, because it shows what is at stake when the integration is missing.
Head Brain alone
When the Head Brain leads alone, the result is over-rationalisation and the procedural rigidity that comes with it. The classic expression is order is order. The decision is defensible on paper and indefensible in human terms. Bureaucracies that destroy the people they were built to serve, leaders who cannot feel why their teams are leaving, professionals who can argue any position and commit to none. This is what a Head Brain looks like when it has no Heart and Gut to disagree with it.
Heart Brain alone
When the Heart Brain leads alone, the result is indiscriminate caretaking. The capacity to feel everyone's pain becomes the inability to discern which pain is yours to carry. Boundaries blur, enabling begins, and burnout follows because the Heart will give until it collapses if no one tells it to stop. This is the well-meaning helper who keeps the dysfunction alive because they cannot bear to set the limit that would end it.
Clinical observation, repeated across two decades of coaching and therapy
Gut Brain alone
When the Gut Brain leads alone, the result is fundamentalism. Conviction without check, action without reflection, I follow what I know to be true whatever the cost to others. History has shown what this pattern produces at scale. Every era has its examples and they are not in the past tense. The Gut is the brain of survival and certainty, and a survival system that is not in conversation with a Heart and a Head will defend its certainty against any cost, including the cost to human beings outside its definition of us. The same biology that makes the Gut Brain decisive and powerful in healthy alignment is the biology that makes it dangerous when the other two are silenced. Power without purpose has a long historical record.
The methodology exists, in large part, because each of these failure modes is what happens when good people get stuck in one brain. The work is not to suppress any of the three. The work is to bring them back into conversation.
2026 AND BEYOND
Why this cannot be automated
A question that did not exist when the methodology was first developed has become unavoidable in 2026. If a large language model can produce coherent, empathic, well-structured coaching dialogue on demand, what does a human practitioner of 3 Brains Intelligence offer that a machine does not?
The honest answer is the cleanest possible argument for why the framework matters.
AI is, by construction, a Head Brain operation at scale. It is pattern, prediction, language and inference. The Thursday ICF International Coaching Week 2026 presentation AI Just Took Your Head Brain's Job makes the case directly: AI now does much of what the Head Brain has historically been paid to do, and it does it faster and at lower cost. Established What it does not do, and on current architecture cannot do, is the other two thirds of the system.
The Heart Brain
The Heart Brain's contribution is relational sensing. It is the felt experience of being in the room with a particular person at a particular moment — the small involuntary shifts in tone, breath, posture and timing that an AI can describe and an AI cannot produce. A language model can write the sentence I could be wrong about this with grammatical perfection. It cannot generate the state behind the sentence that makes it biologically credible to another nervous system. The client's Heart Brain is reading the coach's nervous system, not the coach's vocabulary. That signal does not exist in text.
The Gut Brain
The Gut Brain's contribution is embodied readiness. It is the millisecond-scale survival scan, the sense of safety or threat or timing that arrives in the body before language arrives. An AI does not have a body, an autonomic nervous system or stakes. It cannot get goosebumps, lose appetite, freeze, or know in its chest that something is about to break. The somatic verification a Gut Brain provides at the end of a deep session — the yawning, the slowing of breath, the spontaneous shift of attention to a new topic — is the body confirming that change has metabolised.
Clinical observation, documented across hundreds of supervised sessions No text response can substitute for it, because the verification is in the body, not in the conversation.
A coach who works only at the Head Brain is competing with a machine that is already better and cheaper. A coach trained to work with all three brains is doing work the machine cannot reach.
This is why a 3 Brains Intelligence coach offers something AI does not offer and is unlikely to offer in any near-term architecture. A human practitioner brings biological presence: an autonomic nervous system that can be in a coherent state, transmit safety, and invite the client's system to mirror it. The methodology is built on that transmission. Strip it out and you are left with a Head Brain conversation, which is exactly what AI now does well and cheaply. Keep it in and you have something AI structurally cannot do.
WHERE THE METHODOLOGY LANDS
Applications of the methodology
Coaching
The flagship application. The 3 Brains Coach Certification trains practitioners to diagnose dominance, recognise the twelve protective patterns by brain, and run sessions that reach all three networks rather than only the Head. The certification carries 40 CCEUs of ICF accreditation and 24 PD points with EMCC, and has trained more than 300 certified coaches across 42 countries.
Psychology and therapy
Christoffel's own clinical background in hypnotherapy, psychotherapy, NLP, somatic work and haptonomy is the substrate the methodology was built on. In a therapeutic context, 3 Brains Intelligence offers a framework for understanding why purely cognitive interventions plateau and how to work with stored emotional memory in the Heart Brain and stored survival activation in the Gut Brain.
Clinical observation, integrated with established somatic and depth-psychotherapy traditions
Education
Children, adolescents and university students rarely fail to learn because they cannot understand the material. They fail to learn because one of their brains is unsafe, unheard or in protective shutdown. Teachers trained in the three-brains vocabulary can read which network is offline in the room and address the actual obstacle rather than the surface symptom. Christoffel teaches the framework at IE Business School Madrid and Georgetown University Qatar.
Personal development
The Dominance Test and the 12 Protectors Test give individuals a structured language for the patterns they have spent years calling personality flaws. The shift from what is wrong with me to which brain is leading and what is it protecting is, in the experience of the participants who have completed the assessments, the single most useful reframe the methodology offers.
Clinical observation, n = 4,650+
Corporate leadership
Leaders make decisions under conditions where Head, Heart and Gut routinely disagree and the cost of misalignment is borne by the organisation. The methodology has been taught inside more than 200 companies and is used by executive coaches working with C-suite and board-level clients. Its specific contribution is a vocabulary for the moment a leader knows the decision in the body before the analysis arrives, and a method for testing whether that signal is reliable instinct or unprocessed protective pattern.
HSPs and neurodivergent profiles
A principle the methodology holds across both populations is this: a dominant brain is survival wisdom, not a problem to fix. Whether the dominance was shaped by birth wiring or by life experience, it is the configuration that kept the person alive and functioning. The work is not to suppress it. The work is to bring the other two brains back into the conversation so the person operates by choice rather than by protective habit.
Highly Sensitive Persons. Dr Elaine Aron's three decades of research on Sensory Processing Sensitivity have established that approximately twenty percent of the population carry the trait.Established Internal 3 Brains research adds a finding that has not been reported elsewhere: approximately sixty percent of trained coaches show dominance in the Heart Brain, and high Heart Brain scores correlate with self-reported high sensitivity.
Internal dataset, clinical observation Read together with Aron's work, this gives the methodology a precise vocabulary for what an HSP is in biological terms. The associated traits — empathy, depth, pattern-finding and the capacity to sense a room before anyone speaks — are not weaknesses. They are the signal of a system in which two of the three brains are exceptionally well-calibrated. The challenge is not that the person is broken. The challenge is that a Head-Brain-dominant world has been built without these systems in mind. This application was the subject of the joint ICF International Coaching Week 2025 presentation Heart-Brained Highly Sensitive People: Coaches and Leaders of the Future, delivered by Christoffel and HSP specialist Clare Kumar.
Neurodivergent profiles. Approximately one in seven people in the United Kingdom are neurodivergent, with the figure rising to approximately one in five within the workforce. Established · NHS England 2021, CIPD 2020 Autism referrals to the NHS increased fivefold between 2019 and 2023. The umbrella covers autism, ADHD, dyslexia, dyspraxia, Tourette's and others. There is no medical test for any of them. They are diagnosed by observation and interpretation, which means coaches are already working with neurodivergent clients whether the diagnosis is named in the room or not.
3 Brains Intelligence offers two things to this work that other frameworks rarely combine. The first is a brain-configuration reading of each profile. Autistic profiles typically present with strong Head Brain dominance, system thinking and verbal precision, often with limited access to the Heart Brain's emotional and social signalling. ADHD profiles tend to show Gut Brain dominance, action-seeking and impulsivity, with the Head Brain running fast and the Heart Brain often under-acknowledged but sensitive. Dyslexic profiles tend to combine strong Heart Brain emotional insight with Gut Brain pattern recognition. Dyspraxia is action-oriented with motor-sequencing challenges. Tourette's profiles often combine sharp Head Brain reasoning with strong Gut Brain reactivity and Heart Brain shame loops. Clinical observation
The second is a discipline that protects against misreading. Behaviours that look like neurodivergence can also be produced by temporary states. Emotional outbursts can come from hormonal imbalance. Difficulty focusing can come from sleep deprivation. Impulsivity and fast speech can come from over-caffeination or anxiety. Social withdrawal and flatness can come from burnout. A framework that reads brain dominance and protective patterns rather than diagnostic categories can hold both the trait and the temporary state side by side.
This neurodivergent application of the methodology was the subject of the joint ICF International Coaching Week 2025 workshop Are You Missing This Coaching Blind Spot? The Impact of Neurodivergence, delivered by Christoffel and Alison Sinclair ACC, Self-Leadership Coach and founder of Live Your Truth Coaching, on 13 May 2025.
Gender, equality and diversity
One of the most consequential applications of the methodology is how it reframes the conversation about gender, equality and diversity. The argument, set out in Relationships? Which Brain Is Talking?, is that there are no inherently masculine or feminine traits. There are Head, Heart and Gut Brain traits. What looks like a gender difference is, in almost every case, the visible consequence of having conditioned one brain more in boys — typically the Gut Brain, with its emphasis on competition, achievement and decisiveness — and a different brain more in girls — typically the Heart Brain, with its emphasis on connection, caring and harmony. Once that conditioning has shaped two decades of development, the resulting skill gap is then read backwards as evidence of an innate gender essence. The biology is being mistaken for what culture put there.
The cleanest empirical demonstration comes from work by Hoffman, Gneezy and List (Proceedings of the National Academy of Sciences, 2011), reported in popular science by Maia Szalavitz, on two closely related tribes in north-east India that separated only a few centuries ago. The Karbi live patrilineally: the eldest son inherits, women rarely own land, religious and political leadership is male-dominated, and girls leave school on average nearly four years earlier than boys. The Khasi live matrilineally: the youngest daughter inherits, women own the land, men are not expected to handle money, and both genders are equally educated. The researchers tested 1,279 people across four villages of each tribe on a spatial-reasoning block puzzle, a recognised proxy for mathematical and scientific aptitude. Among the Karbi, men solved it thirty-six percent faster than women. Among the Khasi, the difference between men and women was so small it was not statistically significant. Established · Hoffman, Gneezy and List 2011
Two genetically and historically near-identical populations, in the same hills, eating the same food, growing the same rice. The spatial-aptitude gap that exists in one and is absent in the other tracks the cultural conditioning, not the chromosomes. The conclusion the methodology draws is direct: gender-linked aptitude is not biology. It is brain conditioning, mistaken for biology.
The practical consequence for diversity work is sharp. Programmes that try to close the gender gap by giving women more confidence training, more leadership exposure, or more board seats are working downstream of the actual mechanism. The mechanism is that boys and girls are still being conditioned differently at the level of which brain they are taught it is acceptable to use. A man who develops his Heart Brain risks being called soft. A woman who develops her Gut Brain risks being called bossy. These social penalties act as a brake on brain development long before any board appointment is being discussed. By giving the traits gender-neutral biological names — Head, Heart and Gut — the methodology removes the social trap. A man can develop his Heart Brain without inheriting the label feminine, and a woman can develop her Gut Brain without inheriting the label masculine, because the labels themselves have been moved off gender and onto biology where they belong.
This is the same principle the methodology applies to HSPs and to neurodivergent profiles. The brain configuration a person carries is not the problem. The cultural penalty for the configuration is. Once the penalty is removed, the configuration becomes a resource.
There are no feminine and masculine traits. Only Head, Heart and Gut Brain traits.
The coach does not need a diagnosis to work with the configuration. The client does not need a label to be coached well.
HONEST ABOUT WHAT WE KNOW
How we know what we know
Three categories of claim are made on this page and each is tagged where it appears.
Established Established neuroscience. Peer-reviewed work from named researchers. Armour, Gershon, Damasio, van der Kolk, Siegel, Barrett, Fleming, Garfinkel, the broad findings of HeartMath's instrumented studies, the autonomic anatomy of the vagus, the readiness potential research from Libet.
Emerging Emerging research. Active areas with substantial evidence and some open questions. Heart-transplant cell-memory phenomena, McCraty's heart-rate-variability pre-stimulus findings, parts of the somatic-experiencing evidence base, and the proposed Gut Brain metacognition layer.
Clinical observation Clinical and coaching observation. Patterns observed by Christoffel and the network of trained coaches across more than 4,650 documented assessments and tens of thousands of coaching hours. Large-sample observations from structured practice, labelled as such rather than presented as neuroscience.
The methodology takes care to keep these categories visible rather than to blur them. Coaches and clients deserve to know which kind of claim they are standing on.
COMMON QUESTIONS
Frequently asked questions
What is 3 Brains Intelligence?
It is a neuroscience-based methodology for human decision-making and behaviour change, based on the finding that humans operate through three functional neural networks, in the head, the heart and the gut, each with its own intelligence and agenda. The methodology was developed by Christoffel Sneijders MCC, founder of 3 Brains Intelligence Academy, and is used in coaching, therapy, leadership and education across 42 countries.
Is it the same as Howard Gardner's theory of multiple intelligences?
No. Gardner's theory describes the different content domains in which a person can be intelligent, such as linguistic, logical, musical and interpersonal. 3 Brains Intelligence describes the underlying biological decision system that all of those intelligences run on. The two are compatible. They answer different questions.
Is there real neuroscience behind the Heart Brain and the Gut Brain?
Yes. The Heart Brain was confirmed by neurocardiologist J. Andrew Armour in 1991 and published through Oxford University Press in 1994. The Gut Brain was described by neurobiologist Michael Gershon in The Second Brain in 1998. Both are documented, functional, intrinsic neural networks. Supporting research from HeartMath, Damasio, van der Kolk, Levine, Siegel, Barrett, Pert, Craig, Fleming and Garfinkel extends the picture.
How is it different from Daniel Goleman's Emotional Intelligence?
Emotional Intelligence, as Goleman defined it, is predominantly the trainable surface of what 3 Brains Intelligence calls the Heart Brain. The methodology grounds that capacity in the specific neuroscience of the cardiac neural network and places it alongside the Head Brain and the Gut Brain as three peers in a decision system. Goleman opened the door to non-cognitive intelligence. 3 Brains Intelligence maps the full room.
What does 3 Brains Intelligence say about metacognition?
Metacognition — the ability to know what you know — has been a productive area of current neuroscience. Stephen Fleming (Science, 2010) measured Head Brain metacognition by showing that introspective accuracy varies between people and correlates with prefrontal cortex anatomy. Sarah Garfinkel (Biological Psychology, 2015) measured Heart Brain metacognition by separating interoceptive accuracy from interoceptive awareness. A question Fleming's lab discussed for years and never resolved was whether metacognition is one unified capacity or domain-specific. The 3 Brains framework proposes a resolution: each brain has its own metacognitive layer, dissociable from the others. Head metacognition is the awareness of your reasoning, Heart metacognition is the awareness of your emotional and cardiac state, and Gut metacognition — for which no peer-reviewed instrument yet exists — is the accuracy of your reading of safety, danger, timing and power. Whole-system metacognition is a fourth capacity that only emerges when all three are aligned.
How is 3 Brains Intelligence different from mBraining or mBIT?
Both frameworks work with the same Head, Heart and Gut neuroscience, and 3 Brains Intelligence openly acknowledges Soosalu and Oka's contribution, including their compilation of more than six hundred references in the multiple-brain literature. What 3 Brains Intelligence adds on top of that shared foundation is the 12 Protectors Model, structured diagnostic assessments, an ICF-accredited 40-CCEU coach certification, and a clinical grounding in hypnotherapy, psychotherapy, somatic work and haptonomy. The two are complementary developments of a shared insight, not competing frameworks.
Why does PTSD or trauma persist even when I know the event is over?
Because the part of you that knows the event is over is the Head Brain. The Head is the only one of the three brains that has a concept of time — past, present and future. The Heart Brain and the Gut Brain that stored the trauma do not have a past tense. They experience the stored event as happening now. This is why purely cognitive interventions plateau: cognitive knowing reaches the Head, while the trauma is being held by the brains that do not know what year it is. The methodology works by reaching the Heart Brain and Gut Brain directly, so the stored event can be processed by the systems that are actually carrying it.
Is this coaching or therapy?
The methodology is taught primarily as a coaching framework, ICF-accredited at 40 CCEUs in the Coach Certification, and is used by qualified clinicians in therapeutic contexts. Christoffel holds clinical qualifications in hypnotherapy, psychotherapy, NLP, somatic therapy and haptonomy, which is why the methodology incorporates therapeutic depth while remaining coaching-led for non-clinical practitioners. The boundary between coaching application and therapeutic application is taught explicitly inside the certification.
Who developed 3 Brains Intelligence?
Christoffel Sneijders MCC developed the methodology starting in 2005 and founded 3 Brains Intelligence Academy to teach it. He is an ICF Master Certified Coach, ICF Supervisor, Visiting Professor at IE Business School Madrid and Georgetown University Qatar, author of four books on the framework, and has trained more than 13,000 participants and certified 300+ coaches across 42 countries.
Is the Polyvagal Theory part of 3 Brains Intelligence?
No. Stephen Porges's Polyvagal Theory has been widely used in trauma and somatic work, and the broader observation that the autonomic nervous system shapes engagement and defence is sound. The specific tri-vagal mechanism Porges proposes is, however, not supported by current vagal anatomy. A peer-reviewed critique by Liem and Neuhuber (Deutsche Zeitschrift für Osteopathie, 2021, translation by Grossman and Neuhuber) sets out three core problems: comparative anatomy of cartilaginous fish contradicts the proposed phylogenetic basis, the nucleus ambiguus does not in fact control facial expression or middle-ear muscles as Polyvagal claims, and behavioural states such as fight, flight and freeze are coordinated by the midbrain periaqueductal gray rather than by a vagal pathway. 3 Brains Intelligence does not depend on the Polyvagal mechanism. It works directly with the three neural networks Armour and Gershon described.
Can AI replace this kind of coaching?
No. AI is a Head Brain operation. It produces coherent language, prediction and inference, and does so at scale. What it does not do is generate the autonomic states that the Heart Brain and Gut Brain in the client's system are reading from the coach in the room. Relational safety and embodied readiness are biological, not linguistic. 3 Brains Intelligence is built on the transmission of those states between two nervous systems, which is exactly the part of coaching AI cannot reach.
Can 3 Brains Intelligence be used with neurodivergent or highly sensitive clients?
Yes, and the methodology is particularly well-suited to both populations. The framework reads brain dominance and protective patterns rather than diagnostic categories, which means a coach can work with the configuration without needing a label. Approximately one in seven people in the UK are neurodivergent, and approximately twenty percent are highly sensitive. Internal 3 Brains research has found that around sixty percent of trained coaches show Heart Brain dominance, with strong overlap with high sensitivity. The principle the methodology holds is that a dominant brain is survival wisdom, not a problem to fix.
What does 3 Brains Intelligence say about gender equality and diversity?
The methodology argues that there are no inherently masculine or feminine traits. There are Head, Heart and Gut Brain traits, and most of what looks like a gender difference is the result of having conditioned boys toward Gut Brain dominance (competition, achievement, decisiveness) and girls toward Heart Brain dominance (connection, caring, harmony). The empirical anchor is the Hoffman, Gneezy and List study (PNAS, 2011) of the Karbi and Khasi tribes in north-east India, where the spatial-aptitude gap between men and women existed in the patrilineal society and disappeared in the matrilineal one, despite near-identical genetics. The implication for diversity work is that programmes addressing gender outcomes without addressing the underlying brain conditioning are working downstream of the actual mechanism.
WHERE TO GO FROM HERE
Next steps
If something on this page recognised you, the most useful next step is usually one of these.
SOURCES
References
01
If something on this page recognised you, the most useful next step is usually one of these.
02
Armour, J. A. (1991, 1994). Neurocardiology: Anatomical and Functional Principles. Oxford University Press. Armour 2007 paper (PDF).
03
Aron, E. (1996, 25th anniversary edition 2020). The Highly Sensitive Person. Broadway Books. hsperson.com.
04
Barrett, L. F. (2017). How Emotions Are Made: The Secret Life of the Brain. Houghton Mifflin Harcourt. Foundational text on the predictive-brain and constructed-emotion account.
05
Barrett, L. F. (2020). Seven and a Half Lessons About the Brain. Pan Macmillan.
06
Bernard, C. (1865). Classical writings on sensory influences on the heart.
07
Collins, S. M., & Bercik, P. (2009). The relationship between intestinal microbiota and the central nervous system in normal gastrointestinal function and disease. Gastroenterology, 136(6), 2003–2014.
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Craig, A. D. (2002, 2005, 2009). How do you feel? Interoception and the neural basis of body awareness. Nature Reviews Neuroscience and Trends in Cognitive Sciences.
09
Damasio, A. (1994). Descartes' Error: Emotion, Reason and the Human Brain. Putnam.
10
Darwin, C. (1872). The Expression of the Emotions in Man and Animals.
11
Fleming, S. M., Weil, R. S., Nagy, Z., Dolan, R. J., & Rees, G. (2010). Relating introspective accuracy to individual differences in brain structure. Science, 329(5998), 1541–1543. DOI.
12
Gardner, H. (1983). Frames of Mind: The Theory of Multiple Intelligences. Basic Books.
13
Garfinkel, S. N., Seth, A. K., Barrett, A. B., Suzuki, K., & Critchley, H. D. (2015). Knowing your own heart: Distinguishing interoceptive accuracy from interoceptive awareness. Biological Psychology, 104, 65–74. DOI.
14
Gershon, M. (1998). The Second Brain. HarperCollins. Scientific American summary.
15
Goleman, D. (1995). Emotional Intelligence. Bantam.
16
Grewen, K. M., & Light, K. C. (2011). Plasma oxytocin is related to lower cardiovascular and sympathetic reactivity to stress. Biological Psychology, 87(3), 340–349. DOI.
17
Gutkowska, J., Jankowski, M., Mukaddam-Daher, S., & McCann, S. M. (2000). Oxytocin is a cardiovascular hormone. Brazilian Journal of Medical and Biological Research, 33(6), 625–633.
18
Han, W., Tellez, L. A., Perkins, M. H., Shammah-Lagnado, S. J., de Lartigue, G., & de Araujo, I. E. (2018). A neural circuit for gut-induced reward. Cell, 175(3), 665–678.e23. DOI.
19
HeartMath Institute. Science of the Heart (McCraty, Atkinson, Tomasino, Bradley and colleagues).
20
Hoffman, M., Gneezy, U., & List, J. A. (2011). Nurture affects gender differences in spatial abilities. Proceedings of the National Academy of Sciences, 108(36), 14786–14788. (The Khasi and Karbi tribal study cited in the gender section.)
21
Levine, P. (2010). In an Unspoken Voice. North Atlantic Books.
22
Libet, B. Readiness potential and conscious decision experiments.
23
Liem, T., & Neuhuber, W. (2021). Critique of the Polyvagal Theory. Deutsche Zeitschrift für Osteopathie, 19, 34–37. (Translated from German by Paul Grossman and Winfried Neuhuber.) Peer-reviewed anatomical and phylogenetic critique of Porges's tri-vagal mechanism.
24
MacLean, P. (1990). The Triune Brain in Evolution. Plenum Press.
25
Matsuzawa, T. Cognitive Trade-off Hypothesis. Primate Research Institute, Kyoto University. See also Mind Field (2017), Tetsuro Matsuzawa lecture on cognitive specialisation in humans and chimpanzees.
26
NHS Health Education England (2021). Workforce, Training and Education statement on neurodivergence prevalence. CIPD (2020). Neurodiversity at Work. Aggregated UK prevalence: approximately one in seven population, one in five workforce.
27
Pearsall, P., Schwartz, G., & Russek, L. (2002). Changes in personality following heart transplantation. Integrative Medicine.
28
Pert, C. (1997). Molecules of Emotion. Scribner.
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Porges, S. W. (2011). The Polyvagal Theory. W. W. Norton.
30
Schnall, S., Haidt, J., Clore, G. L., & Jordan, A. H. (2008). Disgust as embodied moral judgment. Personality and Social Psychology Bulletin, 34(8), 1096–1109.
31
Siegel, D. J. (2010). Mindsight. Bantam.
32
Sneijders, C., & Kumar, C. (2025). Heart-Brained Highly Sensitive People: Coaches and Leaders of the Future. ICF International Coaching Week webinar.
33
Sneijders, C., & Sinclair, A. (2025, May 13). Are You Missing This Coaching Blind Spot? The Impact of Neurodivergence. ICF International Coaching Week workshop.
34
Soosalu, G., & Oka, M. (2012). mBraining: Using Your Multiple Brains to Do Cool Stuff. TimeBinding Publications. Foundational adjacent framework and source of the 600+ entry literature compilation.
35
van der Kolk, B. (1994, 2014). The Body Keeps the Score. besselvanderkolk.net.
36
van Veen, V., Krug, M. K., Schooler, J. W., & Carter, C. S. (2009). Neural activity predicts attitude change in cognitive dissonance. Nature Neuroscience, 12(11), 1469–1474.
37
Yakovlev, P. I. (1948). Motility, behavior and the brain.
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