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The Heart-Brain Connection

The heart isn’t just a pump; it’s an intelligent organ that communicates with the brain, shaping our experiences and responses

The Heart-Brain Connection

Article made available by HeartMath LLC (www.heartmath.com)


Most of us have been taught in school that the heart is constantly responding to “orders” sent by the brain in the form of neural signals. However, it is not as commonly known that the heart actually sends more signals to the brain than the brain sends to the heart! Moreover, these heart signals have a significant effect on brain function – influencing emotional processing as well as higher cognitive faculties such as attention, perception, memory, and problem-solving. In other words, not only does the heart respond to the brain, but the brain continuously responds to the heart.


The effect of heart activity on brain function has been researched extensively over about the past 40 years. Earlier research mainly examined the effects of heart activity occurring on a very short time scale – over several consecutive heartbeats at maximum. Scientists at the HeartMath Institute have extended this body of scientific research by looking at how larger-scale patterns of heart activity affect the brain’s functioning.


HeartMath Institute research has demonstrated that different patterns of heart activity (which accompany different emotional states) have distinct effects on cognitive and emotional function. During stress and negative emotions, when the heart rhythm pattern is erratic and disordered, the corresponding pattern of neural signals traveling from the heart to the brain inhibits higher cognitive functions. This limits our ability to think clearly, remember, learn, reason, and make effective decisions.


The heart’s input to the brain during stressful or negative emotions also has a profound effect on the brain’s emotional processes actually serving to reinforce the emotional experience of stress.

In contrast, the more ordered and stable pattern of the heart’s input to the brain during positive emotional states has the opposite effect – it facilitates cognitive function and reinforces positive feelings and emotional stability. This means that learning to generate increased heart rhythm coherence, by sustaining positive emotions, not only benefits the entire body, but also profoundly affects how we perceive, think, feel, and perform.

The Heart’s Influence

Scientists first began recording waveform electrical activity of the heart by measuring voltage changes during heartbeats with the invention of the electrocardiogram (ECG) in 1902. In 1963 the magneto cardiogram (MCG) machine was developed, which provides a map of the magnetic field over the chest generated from the flow of electrical currents during each heartbeat.


Researchers at the HeartMath Institute propose that psychophysiological information can be embedded into the electromagnetic fields produced by the heart. The nervous system acts like an antenna, responding to these rhythmic patterns and electronic impulses. The heart’s magnetic field encodes a person’s emotional state and communicates this throughout the body and to the external environment affecting the nervous systems of other people and animals.


The heart is closely tied to emotions, and our emotional experiences leave energetic imprints within the heart’s cells and electromagnetic field, influencing its overall health. Although the heart lacks a centralised memory centre like the brain, individual heart cells (cardiomyocytes) retain information. These cells “remember” their function, rhythm, and interactions with neighbouring cells and can adapt to changes, such as alterations in workload or stress.

Some facts about the Heart

  • The average adult heart is about the size of a fist and can continue beating even when disconnected from the body.


  • It beats approximately 115,000 times each day, pumping around 2,000 gallons of blood daily.


  • The heart is the most powerful generator of electromagnetic energy in the human body.


  • A heart generates a magnetic field up to 12 feet (approximately 3.7 meters) in diameter around the body.


  • The heart's electrical field is about 60 times greater in amplitude than the electrical activity generated by the brain.


  • The heart’s rhythmic contractions generate electrical impulses that travel through specialist pathways. These impulses coordinate the heartbeat and influences the body down to the cellular level.


  • The heart possesses its own intrinsic nervous system containing over 40,000 neurons, known as the “heart brain” which exhibits remarkable autonomy and intelligence.


  • The heart sends information to the brain conveying emotional states and stress levels. The brain can influence heart rate, blood pressure, and other physiological functions.

The Brain’s Influence

The brain is not fixed, it can be shaped, moulded, or altered throughout life. This is called Neuroplasticity and is the brain’s capacity to continue growing and evolving by creating new neural connections and reorganising existing ones. It adapts based on learning, environmental influences, and even adjusts our thinking patterns. The conscious mind provides the intention, desire, and decision-making and the subconscious the ability to shape our beliefs, behaviours, and predict danger.


The subconscious mind...


  • Forms most of our core beliefs during the ages of 2 and 7, when learning occurs subconsciously. These inputs whether cultural, familial, or experiential form the foundation of our character and beliefs.


  • Is responsible for 95% of our behaviour and decisions and that it can scan information at lightning speed.


  • Doesn’t distinguish between real and imagined experiences. Research has shown that our brain has the same response whether you physically practice a skill or simply imagine doing it.


  • Operates in the present moment, and it doesn’t differentiate between past, present, or future.


  • Doesn’t concern itself with logic or rationality. It operates on a different wavelength, responding to emotions, beliefs, and imagery. When we set intentions or desires, the subconscious focuses on creating what we truly want. So, even if it seems illogical, trust that your subconscious is working behind the scenes to align your reality with your desires.


  • Contains "your version of the truth" such as limitations and beliefs which are not necessarily true. The subconscious remains vigilant, absorbing everything and has no mind of its own, it believes what you feed it.


  • Can be programmed with repetition. By consistently reinforcing positive thoughts, beliefs, and intentions, we can gradually reshape our inner landscape.



Amygdala - The emotional centre which coordinates emotional responses:


  • The amygdala plays a critical role in processing emotions and emotional reactions. It acts as our brain’s alarm system, continuously assessing potential threats and guiding our behaviour accordingly. When it detects danger, it triggers the fight-or-flight response, influencing how we react to potentially hazardous situations.


  • One function of the amygdala is organising patterns that become “familiar” to the brain. If heart rhythm patterns are incoherent during early life, the amygdala learns to expect disharmony as the baseline. Paradoxically, we may feel “at home” with this internal incoherence, even though it causes discomfort. Based on what is familiar to the amygdala, the frontal cortex makes decisions about appropriate behaviour in various situations. Thus, subconscious emotional memories and associated physiological patterns profoundly shape our perceptions, emotional reactions, thought processes, and behaviour.



Hippocampus - The memory centre which attaches emotions to memories:


  • The hippocampus plays a pivotal role in memory formation and consolidation. When we encounter new experiences, it coordinates the encoding of those experiences, ensuring that episodic memories are associated with emotions and effectively stored in long-term memory.



Cerebral Cortex - Crucial for thinking about emotions:


  • The cerebral cortex, also known as grey matter, plays a crucial role in our emotional processes because when we feel an emotion, we also think about that emotion. Its key functions encompass interpreting emotions, expressing how you feel by coordinating facial expressions, gestures, vocal tones, and fostering empathy. This outer layer of neural tissue contributes to our consciousness, memory, reasoning, language, and higher-level cognitive processes.

Some facts about the Brain

  • The human brain contains around 86 billion neurons, each connected to thousands of others, forming a vast neural network. This complexity allows us to think, feel, and experience the world.


  • Synapses are the connections between neurons. An average adult brain has trillions of synapses, allowing for rapid communication and information processing.


  • Although the brain represents only about 2% of an adult’s body weight, it consumes approximately 20% of the body’s energy.


  • While we sleep, our brain remains active. Dreams occur during the REM (rapid eye movement) phase of sleep, and they serve various purposes, including memory consolidation and emotional processing.


  • Mirror neurons fire both when we perform an action and when we observe someone else doing the same action. They play a role in empathy and understanding others’ intentions.


  • The brain can rewire itself in response to learning, experiences, and even injury, this is called Neuroplasticity.


  • The brain and heart engage in a dynamic conversation through the vagus nerve which carries signals bidirectionally.

Reticular Activating System and the impact on thinking cycles

Reticular Activating System (RAS) - Filtering and transmission of sensory inputs


The Reticular Activating System plays a crucial role in shaping our conscious awareness by selectively allowing certain sensory information to reach our conscious mind.


The RAS controls our level of arousal, alertness, and consciousness. It acts as a filter for incoming sensory information, determining which stimuli deserve attention.


During a downward spiral of negative thoughts, emotions, and actions, the RAS plays a crucial role in shaping our focus and perception.


  • RAS and Sensory Filtering: The RAS acts as a gatekeeper for sensory information entering our conscious awareness. When we are in a negative state, the RAS tends to amplify stimuli related to that state. It selectively filters and highlights information that aligns with our current mindset. For example, if we’re feeling anxious, the RAS may emphasize negative cues in our environment, reinforcing the downward spiral.


  • Confirmation Bias: The RAS is closely linked to confirmation bias our tendency to notice and remember information that confirms our existing beliefs or emotions. In a downward spiral, we unconsciously seek out evidence that supports our negative thoughts, further reinforcing them.


  • Attentional Shifts: As our mental state deteriorates, our attention narrows. We become hyper-focused on negative aspects, ignoring positive or neutral cues. This tunnel vision perpetuates the spiral by reinforcing negative thought patterns.


  • Breaking the Cycle: Recognizing this process is essential and by being the observer and consciously shifting our focus, we can interrupt the negative loop and redirect the RAS toward more constructive stimuli.

The RAS responds to what we feed it. Cultivating awareness and intentionally

choosing our focus can help break the cycle of negativity.




“Realize deeply that the

present moment is all you

ever have.

Make the Now the primary

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Eckhart Tolle



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