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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 began recording the electrical activity of the heart in 1902 with the invention of the electrocardiogram (ECG), which measures voltage changes during heartbeats. In 1963, the magnetocardiogram (MCG) machine was developed to map the magnetic field generated by the flow of electrical currents during each heartbeat.
Researchers at the HeartMath Institute suggest that psychophysiological information can be embedded in the electromagnetic fields produced by the heart. The nervous system functions like an antenna, responding to these rhythmic patterns and electrical 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 linked to emotions, and our emotional experiences leave energetic imprints within the heart's cells and electromagnetic field, influencing overall heart health. Although the heart does not have a centralized memory center like the brain, individual heart cells (cardiomyocytes) retain information. These cells "remember" their functions, rhythms, and interactions with neighboring cells, allowing them to adapt to changes such as workload or stress.
Some facts about the Heart
The average adult heart is roughly the size of a fist and can continue to beat 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 that extends up to 12 feet (approximately 3.7 meters) in diameter around the body.
The heart's electrical field is approximately 60 times greater in amplitude than the electrical activity generated by the brain.
The rhythmic contractions of the heart generate electrical impulses that travel through specialised pathways. These impulses coordinate the heartbeat and influence the body down to the cellular level.
The heart possesses its own intrinsic nervous system, which contains over 40,000 neurons, often referred to as the “heart brain.” This system 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 static; it can be shaped, moulded, and altered throughout life. This capability is known as Neuroplasticity, which refers to the brain’s ability to grow and evolve by creating new neural connections and reorganising existing ones. The brain adapts based on learning and environmental influences and even adjusts our thinking patterns. The conscious mind focuses on intention, desire, and decision-making, while the subconscious shapes our beliefs, behaviours, and instinctively predicts danger.
The subconscious mind...
Forms most of our core beliefs between the ages of 2 and 7, when learning occurs subconsciously. These inputs, whether cultural, familial, or experiential create the foundation of our character and beliefs.
Is responsible for 95% of our behaviour and decisions and is capable of scanning information at lightning speed.
Does not differentiate between real and imagined experiences. Research shows that our brains respond in the same way whether you physically practice a skill or simply imagine doing it.
Operates in the present moment, and it does not distinguish between past, present, or future events.
Does not concern itself with logic or rationality. It functions 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" which includes limitations and beliefs that are not necessarily true. The subconscious remains vigilant, absorbing everything without forming its own judgments; it believes what we choose to feed it.
Can be programmed through repetition. By consistently reinforcing positive thoughts, beliefs, and intentions, we can gradually reshape our inner landscape.
Amygdala - The emotional centre that coordinates emotional responses:
The amygdala plays a crucial role in processing emotions and emotional reactions. It acts as the brain’s alarm system, constantly evaluating potential threats and guiding our behaviour in response. When it detects danger, it triggers the fight-or-flight response, which influences how we react to potentially hazardous situations.
One of the amygdala's functions is to organise patterns that become “familiar” to the brain. If heart rhythm patterns are incoherent during early life, the amygdala learns to expect this disharmony as the baseline. Paradoxically, we may feel “at home” with this internal incoherence, even though it leads to discomfort. Based on what is familiar to the amygdala, the frontal cortex makes decisions about appropriate behaviour in various situations. Therefore, subconscious emotional memories and their associated physiological patterns significantly shape our perceptions, emotional reactions, thought processes, and behaviours.
Hippocampus - The memory centre that associates emotions to memories:
The hippocampus plays a pivotal role in memory formation and consolidation. It coordinates the encoding of new experiences, linking episodic memories to emotions and storing them effectively in long-term memory.
Cerebral Cortex - Crucial for thinking about emotions:
The cerebral cortex, commonly referred to 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 approximately 86 billion neurons, each connected to thousands of others, forming a vast neural network. This complexity enables us to think, feel, and experience the world.
Synapses are the connections between neurons. An average adult brain has trillions of synapses, which allow for rapid communication and information processing.
Although the brain represents only about 2% of an adult’s body weight, it consumes around 20% of the body’s energy.
While we sleep, our brain remain active. Dreams occur during the REM (rapid eye movement) phase of sleep and serve various purposes, including memory consolidation and emotional processing.
Mirror neurons activate 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 significantly influences 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 instance, if we’re feeling anxious, the RAS may emphasise negative cues in our environment, reinforcing the downward spiral.
Confirmation Bias: The RAS is closely linked to confirmation bias, which is our tendency to notice and remember information that confirms our existing beliefs or emotions. During 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: Recognising this process is essential. By becoming 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
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Make the Now the primary
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Eckhart Tolle
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