The Intelligence of the Heart. Part 1: Heart Resonance

The Problem of Disembodied Decision-Making

Have you ever made a decision that you couldn't fully explain, but years later realized was exactly the right one? Or perhaps you've experienced the opposite. Everything made sense on paper, yet something inside you hesitated. We are taught to call that intuition, as though the label explains it.

Modern-day intelligence, clear decision-making, leadership, problem-solving, and creativity are often treated as purely cognitive processes that originate in the brain. We celebrate analytical thinking and logical reasoning, reward rational decision-making, and encourage people to "think it through." The brain is the rational agent that gathers information, weighs options, risks and rewards, and selects the optimal outcome, while the body is involved only in a supporting role, carrying the brain through the world. 

Our brain capacities matter enormously. Reason and critical thinking have given us extraordinary gifts. They have transformed medicine, technology, science, and nearly every aspect of modern life. This model, however useful, has a fundamental flaw: it does not describe how humans actually decide. Is the brain our only form of intelligence? What if intelligence is bigger than thinking?

Leaders, clinicians, athletes, and contemplative practitioners across cultures and centuries have long described moments of exceptional clarity that seem difficult to explain through rational analysis alone. They speak of "knowing" before they can articulate why, of sensing that a decision is right or wrong before the evidence is complete. Maybe you’ve sensed that wisdom sometimes arrives as a felt knowing, a settling, or a clarity that seems to live in the chest, and not as a fact-based conclusion. Perhaps the body is contributing information to the decision-making process long before conscious reasoning catches up.

The Brain Was Never Working Alone

Throughout history and across cultures that never met, the heart became the universal symbol of courage, compassion, love, sincerity, grief, truth, and wisdom. We speak of heartbreak, wholeheartedness, learning by heart, and knowing something in our heart. When we speak with deep sincerity, many of us instinctively place a hand over our chest rather than our forehead. Even people who pride themselves on being rational will sometimes admit that a decision simply "didn't feel right."

Meanwhile, the brain has been viewed as the body's command center, the place where thoughts are formed, decisions are made, and intelligence resides. As researchers uncovered extraordinary insights into memory, language, attention, perception, and reasoning, this view only became stronger. The brain quite rightly became the focus of modern understandings of human intelligence, and it remains one of the most remarkable organs in the human body. But remarkable does not necessarily mean independent.

One world says "Trust your heart." The other says "Trust the data." For a long time, those felt like competing ideas. What if listening to the heart isn't the opposite of rational thinking? What if the heart contributes something that rational thinking actually depends upon?

The Heart Intelligence

Our thoughts do not arise in isolation, but within a living physiological system. If the body contributes to decision-making, then what role does the heart specifically play? The heart is a sophisticated sensory organ, continuously gathering information and communicating with the rest of the body. Rather than functioning as a passive pump awaiting the brain's instructions, the heart continuously provides information that shapes perception, attention, emotional regulation, and ultimately the context in which decisions are made.

Most of us intuitively imagine the communication flowing downward. The brain decides. The body responds. But the relationship is far more reciprocal.

"The heart and brain have bi-directional influences on each other."
— Arakaki et al., 2023

The heart sends more signals to the brain than the brain sends to the heart, with more than 80 percent of the connecting vagal fibers being afferent, carrying sensory information from the body to the brain rather than commands from the brain to the body (Arakaki et al., 2023). Every heartbeat provides the brain with a continuous stream of information about the body's internal state.

Neural communication occurs through the vagus nerve and spinal cord. Biochemical communication occurs through hormones and neurotransmitters. Biophysical communication occurs through pressure waves generated by each heartbeat. HeartMath researchers have also proposed that the heart's measurable electromagnetic field may represent an additional avenue of interaction. Countless physiological signals rise into conscious and unconscious awareness, shaping perception long before a thought is fully formed. 

Your brain is never making decisions in isolation, but continuously interpreting information arriving from, and making decisions about, and with, the body itself. How safe does the environment appear? How much energy is available? Is something familiar? Threatening? Are we calm? Overloaded? These signals become part of the context within which the brain interprets the world.

Long before you consciously recognize that you're anxious, your body has already begun changing your breathing, heart rhythm, posture, and muscle tension. Long before you consciously recognize that you feel safe, your physiology has already begun relaxing. Perhaps one reason we underestimate the body's contribution is that this conversation happens almost entirely beneath conscious awareness. We experience the result. We rarely notice the process.

Maybe intelligence has always been less like a computer processing information and more like an orchestra, multiple systems contributing different forms of information that together create a coherent whole.

If the brain depends upon information arriving from the body, then the quality of our decisions may depend, in part, on the quality of the information the body is providing.

The Resonant State - When the Whole System Begins to Synchronize

Heart resonance, or physiological coherence, describes a measurable physiological state in which the heart's rhythmic activity becomes ordered, smooth, and efficient. Rather than operating as independent systems, the body's regulatory networks begin working together with greater coordination, including autonomic, vascular, hormonal, respiratory, and interoceptive pathways, as well as the brain (Shaffer et al., 2014). Heart resonance is an active, responsive state with meaningful implications for how we think, feel, decide, and interact with the world, and not simply an emotion, positive thinking, or relaxation.

Every important decision is made within a nervous system. If that system is chronically stressed, dysregulated, or overwhelmed, it changes the physiological context in which attention, perception, emotional regulation, and reasoning occur.

Measuring the Conversation

Heart resonance isn't about replacing the mind, but about creating the internal conditions in which the mind, and the rest of us, can function at our best. Several interdependent processes make that state measurable.

Heart rate variability (HRV) refers to the naturally occurring variation in the time interval between successive heartbeats. You might assume that a healthy heart should beat with perfect regularity, but the opposite is true. Healthy hearts continuously adjust from one beat to the next. These subtle fluctuations reflect the ongoing interplay between the sympathetic ("activating") and parasympathetic ("calming") branches of the autonomic nervous system, providing a window into the nervous system's regulatory capacity and indexing not just heart health but cognitive flexibility, emotional regulation, and self-regulatory capacity (Shaffer & Ginsberg, 2017). 

HRV reflects the "capacity for regulated emotional responding," or the ability to generate contextually appropriate emotional responses while minimizing interference from emotional distractions (Appelhans & Luecken, 2006; Park & Thayer, 2014). Higher resting HRV is associated with better overall health, self-regulation, executive functioning, longer lifespan, effective coping, and flexible attention control (Arakaki et al., 2023). A rigid heart rhythm is often a sign of a rigid physiological state. A flexible rhythm reflects an organism capable of adjusting, recovering, and responding to life's changing demands.

Slow, diaphragmatic breathing at approximately five to six breaths per minute naturally entrains the cardiovascular system to its natural resonant frequency, the baroreflex, characterized by amplified heart rate variability (HRV), improved autonomic regulation, and increased physiological efficiency (Lehrer & Gevirtz, 2014; Shaffer et al., 2014; McCraty & Shaffer, 2015). This explains why controlled breathing appears across so many contemplative traditions and evidence-based stress interventions alike. This doesn’t mean that every biological system literally beats in unison; rather, the many regulatory systems begin working together with greater efficiency, stability, and coordination.

Emotional regulation is both a contributor to, and a consequence of, heart resonance. HeartMath's research program has reported that self-generated states of positive emotion, like appreciation, care, gratitude, or compassion, are associated with more ordered, coherent heart rhythms, while negative states like frustration and anxiety are associated with more erratic, incoherent patterns (McCraty, 2016). Coherence, in turn, appears to support emotional regulation by stabilizing the autonomic environment in which emotions arise.

Understanding heart resonance may help explain why some moments feel marked by confusion and reactivity, while others are characterized by clarity, discernment, and an almost effortless sense of knowing. People often describe this state as calm, grounded, clear, or deeply present. These experiences are not what define coherence. They are what often emerge from it.

The Heart's Own Nervous System

Embedded within the heart itself is an intricate network of sensory neurons, interneurons, and motor neurons sufficiently extensive and functionally sophisticated to be characterized as its own “little brain” (Shaffer, McCraty, and Zerr, 2014).  This intrinsic cardiac nervous system is capable of local information processing, short- and long-term memory, and generating rhythmic activity independent of direct central nervous system control (Shaffer, McCraty, & Zerr, 2014). 

This internal heart nervous system integrates its inner information with the outer nervous system and continuously sends signals upward to the brain, influencing activity in the responsible for emotional processing, attentional filtering, reaction time, and higher cognitive functions, including memory, problem-solving, and executive function (McCraty & Shaffer, 2015).

The heart does not possess consciousness in the way the brain does, nor does it generate abstract thought, construct language, or solve equations. While the phrase "little brain" should not be taken to mean that the heart thinks as the cerebral cortex does, it highlights that the heart is an active participant in the body's regulatory network rather than a passive organ awaiting instructions. It does participate in creating the conditions from which clear thinking emerges.

Why the Body's Signals Matter

When the brain loses access to the body's contribution, decision-making can deteriorate even when traditional measures of intelligence remain intact. Neurologist Antonio Damasio studied patients with damage to regions of the prefrontal cortex involved in integrating emotion and bodily signals, and demonstrated that without the body's felt signal, the cortex cannot efficiently evaluate options. Many retained normal intelligence, memory, language, and logical reasoning, and could explain problems in remarkable detail, yet struggled to make even relatively ordinary decisions. Some became trapped in endless deliberation over trivial choices, while others made decisions that ignored obvious personal consequences. Simple choices became exhausting. The problem wasn't intelligence in the traditional sense; the problem was that reasoning had become disconnected from the body's evaluative signals. Patients who had lost access to the body’s contribution to judgment became paradoxically paralyzed or reckless in their choices. The rational mind, cut off from felt experience, loses its footing.

From this work emerged Damasio's somatic marker hypothesis, which suggests that the body contributes rapid emotional and physiological signals that help narrow possibilities before conscious reasoning completes its analysis (Damasio, 1994). Rather than replacing logic, these bodily signals make reasoning more efficient by organizing it and highlighting what matters. Decisions become difficult not only when information is missing, but when the physiological signals that help us assign significance to that information are disrupted. Reasoning alone may not be sufficient for good decision-making.

How Heart Resonance Influences the Mind

Research consistently suggests that coherent physiological states are associated with improved emotional regulation, greater autonomic flexibility, enhanced executive functioning, and more adaptive attention (Appelhans & Luecken, 2006; Forte et al., 2019; Arakaki et al., 2023). Those capacities alone would be expected to improve judgment. Forte, Favieri, and Casagrande (2019) found that both increased activating-system activity and decreased calming-system activity are associated with worse performance across attention, processing speed, executive function, and memory. HRV reflects more than physiological regulation. It reflects the flexibility of the system doing the thinking.

Mind–heart resonance is not the replacement of reason with feeling, nor is it an argument that the heart somehow "knows" independently of the brain. The heart contributes not by producing abstract thought, but by continually signaling arousal, safety, stress, openness, and emotional significance.

This does not mean every feeling is true. Fear can masquerade as intuition. Trauma can distort perception. Bias can influence bodily responses just as easily as genuine insight.

The goal, then, is not to trust every sensation unquestioningly. It is to become increasingly skilled at distinguishing signal from noise.

The Felt Sense

Philosopher and psychologist Eugene Gendlin spent years studying a phenomenon he eventually called the felt sense. He observed that people often possess an implicit bodily knowing about situations long before they can articulate it in words. Rather than arriving as a fully formed thought, this knowing emerges as a subtle feeling in the body, a sense that something fits, or doesn't, long before conscious reasoning catches up (Gendlin, 1978).

Gendlin's work appears remarkably compatible with what neuroscience now understands about interoception. Skilled leaders may describe making decisions from this place: a sense of the whole situation held in the body before it is parsed into language. You sense that a decision is wrong before you can explain why. You walk into a room and immediately feel its emotional atmosphere.  The body rapidly integrates of vast amounts of contextual, relational, and historical information into a felt, pre-conscious signal before conscious awareness has fully assembled the story. This allows the brain to rapidly assign emotional meaning, or valence, to incoming information before conscious reasoning has finished its work. Rather than being irrational, this is a rapid, evolutionarily ancient system for integrating past learning and present context into a signal that guides action.

By creating a more regulated autonomic environment, coherence may reduce physiological "noise," allowing the body's signals to become more consistent and easier for the brain to interpret accurately. What seems increasingly clear is that the state of the body influences the quality of the information available to the mind.

The State You Decide From

Think about a decision where everything on paper said yes, and something in your chest said otherwise. Not fear exactly. Not a doubt you could name or defend. A hesitation that arrived before the reasoning did.

Most of us do one of two things with that. We override it, because we can't justify it in a meeting. Or we obey it and call it intuition afterward. Both are ways of not listening. One discards the information; the other refuses to examine it.

There is a third option. Treat the signal as data with a source, and ask where it came from. Was that hesitation reading the situation, or reading your state? This is one reason two people can experience the same situation very differently. The external event may be identical, but the internal physiological landscape through which it is interpreted is not.

The Heart Deserves a Seat at the Table

For centuries, we have looked almost exclusively to the brain when trying to understand intelligence. We spend years learning how to sharpen our thinking, improve our communication, and strengthen our leadership. We train our minds relentlessly. Yet almost no one teaches us to understand the physiological state from which all of those capacities emerge.

The heart is not merely a poetic metaphor for wisdom, nor is it a mystical source of hidden knowledge. It is a biologically active participant in perception, regulation, and decision-making. Through its ongoing communication with the brain, the heart helps shape the physiological conditions under which attention, emotion, and reasoning unfold. A dysregulated system generates noise where signal should be. A coherent one opens that channel.

Wisdom asks more of us. It asks us to cultivate both. To think rigorously. To regulate ourselves intentionally. To examine our assumptions honestly. To remain open enough to notice what has not yet become conscious.

Every important decision you've ever made happened inside a body. That sounds obvious until you realize how rarely we think about it. The next time a decision matters, notice the state you are in before you notice the options in front of you. The heart belongs in the room where decisions are made.

Illuminate yourself, your heart, and your wisdom,

Shauna

Upcoming: Part II of this essay will be part of our L.I.V.E.S. Applied Leadership series.  Part II explores what that looks like in practice - how leaders, under pressure, can learn to work with heart coherence rather than against it.