How Does the Brain Know What the Body Is Feeling?
A groundbreaking 2026 study reveals how the insular cortex maps physical sensations, internal organs, and the relationship between bodily signals and human emotions
Biotech International Institute (BII)
The Brain's Unanswered Questions — Tuesday, November 3, 2026
Introduction: Your Brain Is Listening to Your Body Every Second
Your heart beats.
Your lungs expand.
Your stomach contracts.
Your blood vessels adjust their pressure.
Your immune system responds to changes throughout your body.
Most of these processes happen without your conscious attention.
Yet at certain moments, you become aware of them.
You feel your heartbeat accelerate before an important meeting.
You notice a sudden tightening in your chest.
You experience nausea when something feels wrong.
You recognize hunger, fullness, fatigue, or internal discomfort.
How does your brain know what is happening inside your body?
And why can the same bodily sensation sometimes feel harmless, uncomfortable, or even frightening?
For decades, neuroscientists have investigated how the nervous system monitors the internal condition of the body.
This research concerns a biological process called interoception.
Interoception helps the nervous system detect and interpret internal physiological signals.
It contributes to homeostasis, motivation, emotional experience, and awareness of bodily states.
But one of the field's most important questions remains unresolved.
How does the brain transform physical information from the body into the sensations we consciously experience?
On October 21, 2026, researchers published a remarkable study in Nature titled Functional architecture of the human insula.
The investigators mapped functional differences across a brain region called the insular cortex.
Their findings suggest that the insula contains several specialized subdivisions involved in physical sensation, internal organ-related experiences, and higher-order cognitive processing.
Even more intriguing, the study identified a pattern of communication suggesting that cognitive networks can influence how bodily information is processed within the insula.
This may help explain why what we feel physically is influenced not only by signals originating in the body, but also by how our brains interpret those signals.
For Biotech International Institute, the discovery highlights an important scientific principle.
Understanding neurological health requires investigating the continuous communication between the brain and the body.
---
1. What Is Interoception?
Interoception refers to the sensing, representation, and interpretation of the body's internal physiological condition.
It is sometimes described as an internal sensory system.
But interoception is more complex than simply feeling one's heartbeat.
It involves multiple physiological signals, including information related to:
- Cardiovascular activity
- Respiration
- Gastrointestinal function
- Temperature regulation
- Metabolic state
- Internal discomfort
- Chemical and hormonal conditions
- Immune-related physiological changes
Some of these signals reach conscious awareness.
Many do not.
For example, the nervous system continuously participates in regulating blood pressure without requiring a person to consciously monitor every change.
Similarly, breathing can be regulated automatically, although people can also become consciously aware of their respiratory rhythm.
Interoception therefore connects unconscious bodily regulation with consciously experienced sensations.
It is not controlled by one isolated receptor, nerve, or brain region.
It emerges from interactions among organs, sensory neurons, spinal pathways, brainstem circuits, and higher brain networks.
2. The Difference Between Sensing the Outside World and the Inside of the Body
Human perception involves several interacting sensory systems.
Exteroception concerns information originating outside the body.
Vision, hearing, and many forms of touch provide information about the surrounding environment.
Proprioception concerns the body's position and movement.
It helps you recognize the position of your arm even when your eyes are closed.
Interoception concerns internal physiological conditions.
It contributes to sensations such as hunger, thirst, nausea, respiratory discomfort, and awareness of heartbeat.
These categories are useful, but they are not completely separate.
For example, temperature and pain can involve information about the body's tissues and the external environment.
An individual's interpretation of a sensation can also combine external cues, internal physiological signals, and prior experience.
This integration is one reason brain–body communication is such an important research area.
3. How Do Signals Travel From the Body to the Brain?
Information about internal organs reaches the central nervous system through several pathways.
One major route involves the vagus nerve.
The vagus nerve carries sensory information from numerous internal organs toward the brainstem.
Other pathways involve spinal sensory neurons.
These pathways convey different kinds of internal information.
Specialized sensory endings and associated cells detect physiological changes such as mechanical stretching, chemical conditions, and other signals.
The nervous system processes this information through interconnected circuits.
Some signals reach brainstem structures involved in autonomic regulation.
Others contribute to activity in thalamic and cortical networks associated with perception and emotional processing.
Importantly, the vagus nerve is not the only route connecting internal organs with the brain.
Spinal pathways and circulating physiological signals also contribute.
A complete understanding of interoception therefore requires examining multiple systems rather than attributing all brain–body communication to one nerve.
4. The Insula: A Hidden Region With an Extraordinary Role
Deep within the cerebral cortex lies the insula.
It is concealed beneath portions of the frontal, parietal, and temporal lobes.
Because of its location, the insula is more difficult to investigate directly than many surface cortical regions.
Over many years, researchers have linked insular activity with:
- Pain and temperature perception
- Awareness of bodily sensations
- Visceral discomfort
- Emotional experience
- Salience detection
- Cognitive control
- Integration of sensory information
The insula is sometimes discussed as a center for bodily awareness.
But it is not a simple monitor that displays a perfect readout of physiological conditions.
The new 2026 study suggests that its internal organization is more specialized and more interactive than a single-region explanation would imply.
5. The October 2026 Discovery: Mapping the Human Insula
In Nature, Julian Quabs, Sofia Pantis, Guanpeng Chen, and colleagues published Functional architecture of the human insula.
The study combined multiple research methods involving 87 participants who had intracranial electrodes implanted for clinical reasons.
Researchers used direct electrical stimulation, intracranial electroencephalography, connectivity mapping, and anatomical reference information.
These techniques allowed the investigators to explore functional properties of different insular regions.
Electrical stimulation was especially useful because it enabled the researchers to observe reported sensations associated with stimulating particular locations.
The team also examined electrical relationships among insular subdivisions and connected cortical regions.
Their findings identified four distinct functional regions.
This was an important advance because the researchers were not treating the insula as one uniform structure.
Instead, they investigated how its subdivisions participate in different aspects of human sensation and cognition.
6. Region One: Mapping Pain, Temperature, and Bodily Sensation
The first subdivision identified by the researchers was a dorsal–posterior insular region.
This region was associated with pain-related, temperature-related, and somatosensory information.
The investigators observed evidence of somatotopic organization.
Somatotopy describes a pattern in which different portions of a neural structure correspond to different parts of the body.
For example, neural representations associated with the hand may be organized differently from those associated with the leg.
This type of organization is well established in other sensory brain regions.
The new insula research adds important information about how bodily sensory representations are organized in this deep cortical structure.
It suggests that certain areas of the insula contribute to relatively specific representations of physical sensations.
However, no single brain region creates the entire experience of pain.
Pain involves distributed neural systems and depends on physiological, psychological, and contextual factors.
7. Region Two: Integrating Sensations Across the Body
A second subdivision, located in the ventral–posterior insula, demonstrated access to somatic information across multiple body regions.
This contrasted with the more regionally organized representations observed in the dorsal–posterior subdivision.
The distinction suggests that different posterior insular areas may process bodily information at different levels of organization.
One region may preserve relatively specific information about the location or type of a sensation.
Another may support broader representations involving multiple body areas.
The exact computational functions of these regions require further investigation.
But the findings challenge the idea that bodily sensation is processed in the same way throughout the insula.
8. Region Three: Internal Organs, Nausea, and Anxiety-Related Experiences
The third subdivision was located in the mid-anterior insula.
This region was associated with visceral sensations and anxiety-related states.
Visceral sensations originate from or relate to internal organs.
Examples include nausea and certain forms of internal discomfort.
This is particularly interesting because many emotional experiences have prominent bodily components.
Anxiety may involve a racing heart, altered breathing, gastrointestinal discomfort, or a sense of internal tension.
However, feeling anxious is not equivalent to having a single physiological signal.
Anxiety involves interactions among perception, interpretation, learning, autonomic activity, and neural networks.
The mid-anterior insula findings suggest an anatomical and functional relationship between internal bodily sensations and certain anxiety-related experiences.
They do not establish that anxiety originates exclusively in the insula.
9. Region Four: A Surprising Connection to Higher-Order Cognition
Perhaps the most intriguing findings involved the anterior–polar subdivision of the insula.
Unlike other regions, direct stimulation of much of this area did not consistently produce reportable bodily sensations.
Yet the region demonstrated strong responses during tasks involving salience detection and changes in action mode.
Salience refers to the importance or relevance assigned to information.
For example, a sudden unexpected event may require the nervous system to redirect attention or behavior.
The researchers identified strong connections between the anterior–polar insula and prefrontal cortical networks, including areas involved in cognitive and behavioral regulation.
Most interestingly, the study found an asymmetric pattern of electrical communication.
The anterior region appeared to exert a relatively strong influence on other insular subdivisions.
This suggests a potential mechanism through which higher-order cognitive processing could influence bodily perception.
That does not mean thoughts can arbitrarily control every physical sensation.
Instead, it suggests that bodily experience may emerge through interactions between sensory processing and networks involved in interpretation, attention, and action.
10. Does the Brain Simply Read the Body — or Help Shape What We Feel?
This is the question at the center of Tuesday's article.
A traditional simplified view might describe interoception as a one-way process.
The body generates a signal.
The signal travels to the brain.
The brain recognizes the sensation.
But the new findings support a more interactive framework.
Sensory information reaches cortical networks.
At the same time, activity in cognitive and salience-related networks can influence the processing of bodily information.
This creates an important distinction between physiological signals and conscious bodily experience.
A physiological change can be measured objectively.
The person's experience of that change may also depend on attention, expectations, previous experiences, and neural processing.
The same pattern of bodily activation might be interpreted differently in different contexts.
For example, a rapidly beating heart during exercise may feel normal.
A similar sensation during an unexpected stressful event may feel alarming.
This example illustrates the importance of context.
It does not mean the physiological signal is imaginary.
Rather, perception involves interpreting real signals within a broader neural and situational framework.
11. The Heart–Brain Connection
The cardiovascular system is a major source of interoceptive information.
Specialized receptors detect changes associated with blood pressure and cardiovascular function.
These signals participate in reflexes that help regulate circulation.
Researchers also investigate how cardiac activity relates to attention, emotional processing, and conscious heartbeat perception.
Some experiments examine heartbeat-related neural responses or performance on heartbeat detection tasks.
But interoceptive ability is not one universal skill.
A person may be relatively accurate at detecting one type of bodily signal while performing differently on another.
The brain's representation of cardiovascular activity also involves multiple neural pathways.
The insula is important, but it is one part of a distributed physiological system.
12. Breathing, the Brainstem, and Emotional Experience
Breathing is another important component of brain–body communication.
Respiratory activity is regulated through brainstem networks and influenced by chemical feedback, mechanical signals, and behavior.
People can also consciously change their breathing.
Respiratory signals interact with attention, arousal, and certain emotional experiences.
For example, respiratory discomfort may be accompanied by anxiety.
Conversely, anxiety can alter breathing patterns.
This relationship is bidirectional.
It is important, however, not to assume that changing breathing will treat every neurological or psychiatric condition.
Research into respiratory interoception concerns specific mechanisms that must be evaluated in defined clinical contexts.
The broader scientific point is that breathing provides continuous information that can interact with brain activity.
13. The Gut–Brain Connection Extends Beyond Digestion
The gastrointestinal system also communicates with the nervous system.
Signals from the digestive tract contribute to sensations involving hunger, fullness, nausea, and discomfort.
These interactions involve neural, hormonal, and metabolic pathways.
The enteric nervous system regulates many gastrointestinal functions locally.
The vagus nerve and spinal pathways contribute to communication with the central nervous system.
Researchers also study how gut microbial processes may influence host physiology.
However, it is important not to confuse these different mechanisms.
The neural processing of nausea, the hormonal regulation of appetite, and microbiome-related influences are distinct research questions.
The 2026 insula study offers insight into how visceral sensations are represented within human cortical circuits.
It does not establish a direct microbiome treatment pathway.
14. Could Interoception Help Explain Differences in Anxiety?
Interoception is increasingly discussed in research on anxiety and other psychiatric conditions.
Some individuals may experience strong bodily sensations and interpret them as threatening.
Others may have difficulty detecting or accurately identifying certain internal signals.
Researchers investigate several dimensions of interoception, including:
- Objective performance on physiological detection tasks
- Self-reported awareness
- Attention to internal sensations
- Interpretation of bodily changes
- Confidence in those interpretations
These dimensions do not always align.
Someone who frequently notices bodily sensations is not necessarily more accurate at identifying them.
Similarly, heightened attention to bodily signals does not automatically mean better physiological regulation.
The new mapping study provides a potentially important anatomical framework for studying interactions between visceral sensation and cognitive processing.
But it does not demonstrate a specific treatment for anxiety disorders.
15. What About Chronic Pain?
Pain is one of the most important areas in which sensory signals and neural interpretation interact.
Nociception involves neural processing of potentially damaging stimuli.
Pain, however, is a subjective sensory and emotional experience.
The two are related but not identical.
The insular cortex contributes to distributed networks involved in pain processing.
The October 2026 study showed that different insular subdivisions have distinct relationships with bodily sensation and cognitive processing.
This raises questions about how higher-order signals influence pain experience.
Could attention modify the processing of nociceptive information?
How do expectations affect bodily perception?
Which neural pathways influence the perceived intensity or unpleasantness of pain?
Can researchers distinguish changes in subjective pain from changes in peripheral tissue pathology?
These are scientifically important questions.
But the study does not show that chronic pain can be eliminated by thinking differently.
Nor does it prove that altering insular activity will treat a particular pain disorder.
Pain biology requires careful evaluation at peripheral, spinal, cortical, immune, and behavioral levels.
16. A New National Research Effort Reflects Growing Interest
The scientific importance of interoception extends beyond a single study.
On September 29, 2026, UCLA Health announced a $3.5 million federal award to establish a national coordinating center for interoceptive neuroscience.
The initiative involves investigators and institutions working across neuroscience, physiology, medicine, bioengineering, and computational science.
Its goals include strengthening shared research resources, terminology, data standards, and collaborations across experimental approaches.
This investment reflects a broader challenge facing the field.
Research into brain–body communication is distributed across many specialties.
Cardiovascular researchers investigate heart-related signals.
Gastrointestinal researchers study visceral sensory pathways.
Neuroscientists examine neural circuits.
Psychiatric researchers investigate internal sensations and emotional states.
A more integrated framework may help scientists connect those findings without assuming they are all manifestations of the same biological mechanism.
17. Why This Discovery Matters for Neurological Drug Research
The insula study is primarily a human systems-neuroscience investigation.
It is not a drug-discovery experiment.
Nevertheless, it demonstrates why treatment research must distinguish among several levels of biology.
A potential intervention might alter peripheral sensory signaling.
Another might affect inflammatory pathways.
Another could influence central neural processing.
These mechanisms are not interchangeable.
For investigational molecules, scientists must establish what biological target is engaged, whether the relevant exposure is achieved, and whether measurable changes occur in appropriately selected experimental systems.
Changes in cellular biomarkers cannot automatically establish changes in conscious perception.
Similarly, a behavioral observation does not necessarily identify a molecular mechanism.
High-quality translational research requires experiments that connect the appropriate biological levels.
18. What This Means for BII's Research Programs
At Biotech International Institute, our investigational programs address different questions concerning neurological function and recovery biology.
Neurophorol™
Our cannabinoid-inspired, CB2-oriented small-molecule research direction focuses on receptor pharmacology and neuroimmune-related mechanisms.
The new interoception research highlights the importance of distinguishing peripheral biological signaling from central perception.
It does not establish any activity of Neurophorol™ within the insula, vagal pathways, or interoceptive networks.
Mycophorol™
Our fungal-inspired neurological research direction includes hypotheses involving neurotrophic signaling and neural resilience.
The interaction between brain networks and bodily experience provides broader scientific context for investigating neural function.
However, BII has not demonstrated that Mycophorol™ changes interoception, emotional processing, or insular connectivity.
NeuroReset™
Our research-stage recovery-biology platform explores questions involving neural adaptation, stress-related mechanisms, and post-dependency function.
The relationship between internal bodily sensations and emotional or motivational states may inform future scientific questions relevant to recovery research.
But this connection is conceptual.
It is not evidence that NeuroReset™ modifies bodily awareness, reduces anxiety, or treats addiction.
Any proposed link between BII candidates and interoceptive mechanisms would require direct experimental validation.
19. Important Limitations of the 2026 Study
The findings are significant, but several limitations should guide interpretation.
Specialized participants
The 87 participants underwent intracranial electrode implantation for clinical reasons.
They do not represent a randomly selected healthy population.
Electrode coverage
Intracranial electrode locations depend partly on clinical requirements.
Coverage is not identical across individuals.
Electrical stimulation
Stimulation can help identify causal relationships between an intervention and an immediate response, but it does not reproduce every aspect of natural physiological signaling.
Subjective reports
Some findings depend on what participants report experiencing.
An absence of a reported sensation is not necessarily an absence of all neural activity.
Network complexity
Asymmetric electrical interactions provide evidence of functional organization, but they do not establish a complete model of how every bodily feeling is generated.
Clinical application
The study did not evaluate a drug or demonstrate an approved treatment.
These considerations do not diminish the achievement.
They help define what the findings actually establish.
20. What Scientists Still Need to Discover
The new study opens several important research directions.
How do insular subdivisions process signals from different internal organs?
Can researchers determine which features of bodily experience are constructed through top-down processing?
How do interoceptive networks change during chronic stress?
Are certain patterns altered in anxiety disorders?
How does interoceptive processing interact with pain persistence?
Do developmental or age-related changes affect insular functional organization?
How do other networks influence the significance assigned to bodily sensations?
And can better measurement of brain–body communication help researchers design more precise experimental approaches?
Answering these questions will require collaboration across multiple disciplines.
Closing Thought: The Brain and Body Are Not Separate Conversations
For much of everyday life, people think about the brain and body as if they were separate systems.
The heart pumps blood.
The lungs exchange gases.
The stomach processes food.
The brain interprets the world.
But the reality is considerably more interconnected.
The nervous system continuously receives information about the body's internal condition.
It participates in regulating physiological activity.
And through interactions involving brainstem circuits, the insula, and broader neural networks, it contributes to the sensations people experience.
The October 2026 discovery offers a more detailed picture of how the human insula is organized.
Different subdivisions participate in different aspects of bodily sensation.
Some are associated with pain and temperature.
Others with visceral experience.
And another appears strongly connected with higher-order cognitive systems capable of influencing sensory processing.
The implication is profound.
The brain does not merely receive information about the body. It also participates in shaping how that information becomes experience.
For Biotech International Institute, this reinforces an important research philosophy.
Understanding neurological function requires studying relationships among cells, circuits, organs, and behavior.
The future of neuroscience may depend on connecting these levels rather than treating them as separate scientific problems.
Research-stage. Built for validation.
Mechanism first. Validation always.
Biotech International Institute
Science. People. Communities. A Healthier Tomorrow.
---
Scientific References
1. Quabs, J., Pantis, S., Chen, G., et al. (2026).
Functional architecture of the human insula.
Nature. Published October 21, 2026.
2. Conroy, G. (2026).
Huge mapping study reveals how your brain tracks what your body is feeling.
Nature News. October 21, 2026.
3. Wang, R. L., & Chang, R. B. (2024).
The Coding Logic of Interoception.
Annual Review of Physiology, 86, 301–327.
4. Singer, J., & Damasio, A. (2025).
The physiology of interoception and its adaptive role in consciousness.
Philosophical Transactions of the Royal Society B.
5. Feldman, M. J., Bliss-Moreau, E., & Lindquist, K. A. (2024).
The Neurobiology of Interoception and Affect.
Trends in Cognitive Sciences, 28(7), 643–661.
6. UCLA Health (2026).
UCLA researchers to lead NIH-funded center to advance science of interoceptive neuroscience.
September 29, 2026.
Research disclosure: This article discusses independent scientific research. BII's Neurophorol™, Mycophorol™, and NeuroReset™ platforms remain investigational. No clinical efficacy, safety, or direct effect on the insula or interoceptive pathways has been established for these programs. No therapeutic claims are being made.
