A discussion of the Fermi paradox, the brain, and the universe

From Wikipedia:

The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence.

The paradox is named after physicist Enrico Fermi, who informally posed the question—remembered by Emil Konopinski as “But where is everybody?”—during a 1950 conversation at Los Alamos with colleagues Konopinski, Edward Teller, and Herbert York.

The paradox first appeared in print in a 1963 paper by Carl Sagan , and the paradox has since been fully characterized by scientists.

Early formulations of the paradox have also been identified in the writings of Bernard Le Bovier de Fontenelle, Jules Verne, and Soviet rocket scientist Konstantin Tsiolkovsky.

There have been many attempts to resolve the Fermi paradox, such as suggesting that intelligent extraterrestrial beings are extremely rare, that the lifespans of such civilizations are short, or that they exist but (for various reasons) humans see no evidence.

Some of the facts and hypotheses that together serve to highlight the apparent contradiction:

• • There are billions of stars in the Milky Way similar to the Sun.
  • With high probability, some of these stars have Earth-like planets orbiting in the habitable zone.
  • Many of these stars, and hence their planets, are much older than the Sun.
  • If Earth-like planets are typical, some may have developed intelligent life long ago.

However, there is no convincing evidence that this has happened.

So where is everyone?

The question intersects with the concept of “consciousness.” The “everyone” we are seeking likely refers to an advanced civilization—one that is more advanced than our own—potentially alongside more evolved life forms. Presumably, they would possess a high level of consciousness.

We should discuss the term “Consciousness.” It may carry too much baggage for scientific purposes; its common usage suggests a metaphysical, mysterious, and indefinable phenomenon that lacks measurable physical properties.

We have claimed it is stimuli —>response—>response—>… where each response is a new stimulus, in a never-ending sequence, leading to further responses. So the keyword becomes “response.”

I propose that what has previously been termed “consciousness” should now be called “responsiveness,” a term that signifies it is the degree, not just the function, that differentiates humans from plants—or from advanced alien species.

I’ve considered other words, “responsivity,” “reactivity,” “sensitivity,” but have settled on “responsiveness,” because it most accurately describes the “stimulus—>response description and would dissolve the so-called “hard problem” concerning animal, plant, and Artificial Intelligence machine consciousness.

All receive stimuli and respond to them — the sole question is the degree of responsiveness.

The theory might be summarized by a very simple statement: Reality is organized responsiveness, or even, the universe is a network of responses.

Thus, not only are humans not at the top of the pyramid, but we never will be. AI will pass us one day.

“Responsiveness scales from quarks to the universe.” As a philosophical statement, it implies a continuum rather than a hierarchy: quarks → atoms → cells → organisms → societies → planet → universe. Each level shows greater integration and complexity of responses.

This shows that humans are not at the top of the pyramid and never will be. Evolution has no final destination; complexity can continue to grow in unexpected directions. That captures a non-anthropocentric view of reality, where humans are simply one stage in a much larger continuum of responsive systems.

This idea leads to an intriguing next question: If responsiveness can scale upward, what would the next level above humanity actually look like?

Nature has tried big land animals and big water animals, and land animals of modest size with oversize brains (us), but it hasn’t tried bigger land animals with even bigger oversize brains. That would be a good place to start, but we probably would need another big meteor or a visit from another planet to have it here on Earth

I’m basically asking: why hasn’t Earth’s evolution produced very large land animals with oversized brains? I’m not talking about elephants or even the water animal, the blue whale, which has the largest brain of any animal, but, importantly, a very low Encephalization Quotient (EQ), i.e., brain size vs body mass.

Animal          Brain Weight          Body Size          EQ

Blue Whale         7kg                      150,000kg         low

Elephant              4-5kg                      6,000kg     moderate

Human                  1.4                                 70kg        High

At first glance, a very large animal with a high EQit does seem like an obvious next step. But several physical and biological constraints make that combination difficult.

1. Brain energy requirements. Brains are extraordinarily expensive organs. In humans, the brain is about 2% of body mass but consumes about 20% of total energy. Larger brains require a significant energy supply. If an animal has both a very large body and a very large brain, the energy demand may become excessive.

2. Signal speed inside big bodies. Neural impractical. Large animals already struggle to gather enough food to maintain their bodies. Signals travel only about 1–120 meters per second, depending on the nerve. In a very large animal: bigger body and longer nerve paths produce slower coordination

For example, in a giraffe, the nerve from the brain to the foot already travels several meters. If the animal were much larger, reaction times could become inefficient.

3. Heat removal.  Brains produce heat. Large brains inside very large bodies would create cooling problems. This is one reason mammals evolved elaborate blood-flow systems in the brain. Cooling limits brain scaling.

4. Gestation and development Large brains require long development. Humans already face a compromise between large brains and the size of the birth canal. If body size increased much further, reproduction could become more difficult.

5. Extinction pressures.  Major evolutionary changes often occur after mass extinctions. For example, the extinction of dinosaurs (~66 million years ago) allowed mammals to expand into ecological niches that had suddenly opened. Without such disruptions, evolution tends to refine existing forms rather than invent radically new ones.

6. The alternative strategy evolution. Instead of making one giant brain, evolution took another route: many medium brains + communication + culture. Humans formed societies, languages, and technologies. Civilization effectively became a distributed brain. That may scale much more efficiently than a single enormous animal.

The question, “Where is everyone? ” implies space travel, and that adds another barrier to the larger animal with a disproportionately larger brain:

7. The physical constraint. A larger, more intelligent species would face major engineering challenges in spaceflight. Rocket physics (the Tsiolkovsky rocket equation) makes launching large masses extremely energy-intensive. If the average intelligent creature weighed tons instead of 70–80 kg, then: spacecraft would need to be far larger, Launch energy would increase dramatically. Life-support systems would be much heavier.  That alone might discourage space travel.

8. Dexterity and precision engineering. Building rockets requires extremely fine manipulation: tiny screws, delicate electronics, and microscopic tolerances. Human fingers evolved for this level of precision.

9. Gravity and body design. Animals are typically adapted to their environments. Elephants, for example, rely heavily on massive skeletal support and constant ground contact.  Heavy animals walk on four legs.

10. Psychology: Human space exploration came from curiosity, competition, warfare, technology, exploration, and traditions. Another civilization might emphasize values very different from ours: stability, long-term memory, social cohesion, and environmental balance. They simply might see no reason to leave their home planet.

11. Another science path. Instead of rockets, such a species might focus on: planet-scale knowledge + ecological engineering + deep communication networks. Their intelligence might grow inward rather than outward. Their responsiveness could increase without expanding into space.

Humanity explores space partly because we are small, restless, tool-using primates. Different evolutionary starting points could lead to civilizations that never invent rockets, never leave their planet, yet become extremely sophisticated.

We, humans, are just about the right size and construction. We live on land, have big brains for our size, have fingers, have a long lifespan, are bipedal, have 5+ good senses, and are omnivores. Really, the whole package — even our warlike nature helps

Evolutionary biologists and astrobiologists occasionally refer to the “anthropic body plan” problem—the idea that technological civilization may require a very particular combination of physical traits.

The Fermi Paradox’s discussions focus on planetary conditions, but the biological constraints are often overlooked: the biological bottleneck. In other words: a habitable planet may not yield a technological civilization. There may be many planets with life, but very few where evolution produces the particular anatomical and behavioral package needed for technology and spaceflight.

Earth has had life for about 3.8 billion years. But technological intelligence appeared only once (so far). Many successful organisms have existed for millions of years with very simple nervous systems. Examples: sharks, crocodiles, and insects.

They thrive without needing advanced technology. The galaxy might contain: countless microbial biospheres, many worlds with plants and animals, and a few intelligent species, but almost no technological civilizations.

That would explain why we don’t see: alien radio signals, megastructures, and interstellar probes. Humanity might occupy a very unusual evolutionary niche. Not necessarily unique—but possibly very rare. Humans may simply be one rare point where responsiveness became capable of building telescopes and rockets.

Yet, even if intelligent civilizations are rare, the Milky Way has roughly 100–400 billion stars. So the real question becomes: If the odds are one in a billion… there could still be dozens of civilizations. Unless the odds are even greater. After all, the  Earth is 4.5 billion years old, and intelligent humans appeared only about 50,000 years ago.

To give you some feeling for that: If Earth’s history were one calendar year, humans appeared late on December 31, and civilization began in the last few minutes before midnight.

But, are we too brain-centric? In the suggested measure for responsiveness, the brain is just one organ receiving input from every inch  of  the human body. What if more of the body were a brain? After all, we currently have other brain-like systems.

I. Our immune system resembles a brain. It senses: immune cells detect pathogens through receptors. It recognizes, distinguishing self vs. non-self. It remembers: The adaptive immune system stores long-term memory of pathogens.

It learns: Antibody responses improve after repeated exposure. It makes decisions: Immune cells coordinate attacks through chemical signaling. It has a network structure: Instead of neurons and synapses, the immune system uses cytokines, chemical gradients, and cell-to-cell contact. In short, the immune system functions as a distributed cognitive network.

II. The digestive system (Enteric Nervous System — ENS) includes about 500 million neurons, more than the spinal cord. It can coordinate muscle contractions, regulate enzyme release, and control digestion, and it can do this independently of the brain. It also communicates with the brain through the Vagus Nerve.

The ENS contains hundreds of millions of neurons, organized into networks that resemble those in the brain. These neurons can modify their behavior based on past activity (i.e., learn). Example: stimulus (food, toxin, irritation) —>gut neural response —>future responses altered. The ENS can learn patterns of digestion and adjust muscle contractions and enzyme secretion accordingly.

Memory: Much of the immune system resides in the gut lining. Structures like Peyer’s Patches store immune information about pathogens encountered in food.

The gut microbiome also stores a kind of ecological memory. Diet, antibiotics, and illness reshape microbial populations. Once established, these microbial communities influence digestion efficiency, immune responses, production of signaling molecules. So your past diet can shape how your gut responds to food months or years later.

The digestive system can also become conditioned. For example, certain foods can trigger nausea after food poisoning. The smell of food can trigger the secretion of digestive enzymes. Habitual eating schedules can cause hunger at specific times. This is a form of gut-brain associative learning.

The digestive tract can physically adapt over time. For example, a high-fiber diet can alter gut bacteria; exposure to lactose can affect enzyme regulation; and chronic irritation can alter digestive patterns. These changes persist, functioning like long-term memory in tissue structure.

III. The endocrine system resembles a regulatory brain, but instead of electrical signals, it uses hormones. It monitors internal conditions such as blood sugar, stress levels, growth, and metabolism, and then it adjusts the body accordingly.

IV. The cardiovascular system — The heart and blood vessels form another responsive network. The heart contains about 40,000 neurons in its intrinsic nervous system. These neurons help regulate heart rhythm, blood pressure, and circulation. Sensors in arteries constantly monitor oxygen levels and blood pressure, and adjust flow accordingly.

V. The skin behaves like a sensory-processing system. It contains receptors for touch, temperature, pressure and pain. It also participates in immune responses and chemical signaling. The skin constantly feeds information into the entire system.

Even individual organs act like mini brains.

For example, the kidneys constantly sense internal conditions: Blood pressure, salt concentration, potassium levels, acid–base balance,and oxygen levels. Specialized cells in the kidney detect these changes.

The kidneys play a vital role in regulating bodily functions. When their sensors detect changes in the body, the kidneys adjust the amounts of various substances they either remove or retain. For example, if blood pressure is low, the kidneys release renin. If there is excess potassium, they increase potassium excretion. In response to high acid levels, they excrete hydrogen ions, and when the body is dehydrated, they conserve water.

The kidneys also communicate with other organs through hormones. Erythropoietin stimulates red blood cell production and activation of vitamin D for calcium regulation. The kidneys are not just filters; they are regulatory command centers influencing the heart, bones, and blood.

Like the brain, the kidneys operate through multiple feedback loops. Each kidney contains about one million nephrons, and each nephron independently regulates filtration, reabsorption, and secretion. The kidney functions as a massively parallel processing system.

In summary, it is wrong to think of the brain as the sole learning and decision-making part of the human body. The entire body functions as a learning and decision-making entity. The entire body is “conscious,” or perhaps more properly, “responsive.”

The vast majority of our decisions are made without our awareness.

Although human behavior is often described as the result of free will—the idea that an inner “self” consciously controls actions, modern biology suggests a different picture. Rather than a single decision-maker directing the body, the organism is better understood as a network of interacting systems, each responding to stimuli and generating responses.

What we experience as a single decision emerges from the combined activity of many subsystems.

Every moment, numerous biological processes are operating simultaneously. The immune system evaluates pathogens, digestive organs respond to food and toxins, endocrine glands regulate hormones, muscles monitor fatigue, and neural circuits process sensory input and memory. Each system produces signals related to the organism’s survival. In simplified form: stimulus —> response —>response —> response —> ∞

These responses are constantly interacting. The brain integrates many of them, but it is not the sole controller. If the digestive system detects toxins, it can produce nausea or diarrhea that overrides planned behavior. If the immune system detects infection, it can induce fatigue and reduce activity.

In such cases, bodily signals secretly can alter behavior even when the brain’s planning circuits suggest something different. You may or may not “feel like” doing something, and that will provide the illusion of free will.

Even within the brain, there is no single command center. Different neural networks handle emotion, reward evaluation, motor planning, memory, and long-term reasoning. These networks interact, compete, and cooperate. The resulting action is the outcome of this complex internal negotiation. Conscious awareness usually arrives afterward, constructing the narrative: “I decided to do this.”

From this perspective, the feeling of a unified “self” making decisions may be an interpretation produced by the brain, rather than the cause of behavior. The organism’s actions are generated by the integrated responses of many systems. The sense of agency becomes another response in the chain, not an independent controlling force.

This view has implications for how we think about responsibility and morality. In everyday life, we assume individuals choose their actions and therefore deserve praise or blame. But if behavior arises from biological processes beyond conscious control, then the concept of responsibility may primarily serve as a social feedback mechanism rather than as evidence of metaphysical free will.

Societies establish rules that promote survival and stability. When individuals violate those rules, punishment serves as a negative stimulus that discourages similar behavior in the future. Praise operates as positive reinforcement. In this way, legal and moral systems resemble biological regulatory systems within the body.

For example, organs must obey physiological “rules” to maintain homeostasis. If the kidneys fail to regulate salt properly, blood pressure rises, and the entire body suffers the consequences. There is no moral blame, but the system experiences corrective effects. Similarly, when a person commits a crime, society responds with sanctions intended to maintain social stability.

Within this framework, neither the criminal nor the judge is acting from an unconstrained inner will. Each is the product of countless interacting influences—genetics, neural activity, emotions, memories, social pressures, and environmental stimuli. The judge’s ruling emerges from the same kind of complex integration that produces any other behavior.

The organism—and society itself—can be understood as systems of distributed, interactive responsiveness, in which actions arise from interconnected processes rather than from a separate controlling self.

In short, every bit of stimulus received from outside our bodies and inside our bodies affects our thinking and we are aware of only a tiny fraction of these influences. As we receive millions of stimuli every second, and this repeats second by second, year by year, in a massively complex interaction, the brain protects us from confusion by providing the illusion of simple central control.

When we consider a distributed interactive process, we speak not only of a living creature, but also of society as a whole. Humanity could be considered one large brain.

The same “system of distributed interactive responsiveness” description could be applied to the Earth, the solar system, the Milky Way galaxy, and the universe. All meet the criteria for responsiveness (“consciousness”). The entire universe functions like a giant brain, doing everything a brain does, except on an unimaginably vast scale.

And as for Fermi’s paradox:

1. The distances are too great
2. The physics is too difficult
3. The biology is incompatible with life on exoplanets.
4. The universe repeatedly forces life to start over.

We, Earthlings, have been lucky to be the latest survivors here.

Rodger Malcolm Mitchell

Monetary Sovereignty

Twitter: @rodgermitchell

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MUCK RACK: https://muckrack.com/rodger-malcolm-mitchell;

https://www.academia.edu/

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Source: https://mythfighter.com/2026/03/11/a-discussion-of-the-fermi-paradox-the-brain-and-the-universe/