By Layla Zulfa 
Does the spark of consciousness require the wet, pulsing machinery of flesh and blood? For centuries, human inquiry into the nature of the mind has been inextricably linked to our own biological heritage. We equate consciousness with neurons, neurotransmitters, and the delicate chemistry of the mammalian brain. However, a provocative new working paper by Eric Schwitzgebel, a distinguished professor of philosophy at the University of California, Riverside, and Jeremy Pober, a postdoctoral researcher at the University of Lisbon, challenges this foundational assumption.
The authors propose that consciousness is not a biological privilege reserved for Earth-based organisms, but rather a "substrate-flexible" phenomenon. By decoupling the experience of mind from the specifics of human biology, Schwitzgebel and Pober are opening a door to a vast, cosmic perspective on what it means to be sentient.
The Core Argument: Substrate Flexibility
At the heart of the authors’ thesis is the philosophical concept of "substrate flexibility." This principle suggests that certain properties are not tied to the specific materials used to construct them.
Consider the humble cup: its function—to hold water—is independent of whether it is crafted from glass, plastic, ceramic, or metal. Similarly, the act of storing information is substrate-independent; it can exist on stone tablets, paper, vinyl records, or within the binary architecture of a solid-state drive. Schwitzgebel and Pober argue that consciousness functions in much the same way. It is a functional property that, once a certain threshold of complexity and information processing is met, can emerge from a variety of physical substrates.
"The universe may contain minds stranger than we can imagine," says Schwitzgebel. By moving away from "terrocentrism"—the unjustified assumption that Earth-based biological life is the benchmark for all existence—the authors argue that we are likely blinded by our own evolutionary history.
Chronology of an Idea: From Copernicus to Artificial Minds
The intellectual lineage of this paper traces back to the Copernican Revolution. In the 16th century, Nicolaus Copernicus fundamentally altered humanity’s view of its place in the cosmos by demonstrating that the Earth is not the center of the solar system. This "Copernican shift" has been repeated throughout history: we learned that our sun is but one of billions, that our galaxy is one of trillions, and that the universe is vast, indifferent, and teeming with complexity.
Schwitzgebel and Pober argue that we are currently undergoing the final, most intimate Copernican shift: the realization that our minds are not the "center" of consciousness.
The Evolution of the Debate:
- The Anthropocentric Era: For millennia, consciousness was viewed as a divine spark, uniquely bestowed upon humans and perhaps higher animals.
- The Biological Era: As neuroscience matured, consciousness became synonymous with the biological brain, leading to the belief that if you replicate the biology, you replicate the mind.
- The Current Paradigm (The Copernican Principle of Consciousness): The authors suggest we are now entering an era where we must accept that consciousness is a phenomenon capable of appearing wherever evolution—or design—produces the right forms of systemic complexity, regardless of the material.
Supporting Data: The Statistical Probability of Alien Minds
The authors bolster their philosophical claims with a robust statistical foundation. Astronomers estimate the observable universe contains approximately one trillion galaxies. Given the sheer abundance of planets, the probability that Earth is the sole crucible for consciousness is vanishingly small.
Schwitzgebel and Pober adopt a conservative estimate, suggesting that at least 1,000 behaviorally sophisticated, extraterrestrial civilizations have existed throughout the cosmos. This estimate, they note, is grounded in recent scientific surveys suggesting that, at a minimum, one civilization arises per galaxy over the course of its lifetime.
If these civilizations exist, is it plausible that they all mirror our own carbon-based, DNA-driven biology? Astrobiologists have long hypothesized that life could arise in environments vastly different from Earth, utilizing alternative amino acids, different solvents, or even exotic chemical structures.
The authors point to the fictional, yet scientifically rigorous, example from Andy Weir’s Project Hail Mary. In the novel, the alien character Eridian possesses a shell of oxidized minerals, mercury-based blood, and a brain composed of crystalline structures. While this is fiction, it serves as a conceptual scaffold for the authors’ argument: if life can thrive on a super-hot, ammonia-saturated planet, why should we assume its internal experience of "being" must rely on the same chemical reactions found in a human neuron?
Official Perspectives: The Divergence of Minds
While Schwitzgebel and Pober co-authored the paper, they diverge significantly when the conversation shifts to the most pressing application of their theory: Artificial Intelligence.
The Skeptical View: Jeremy Pober
Pober maintains a cautious stance regarding modern silicon-based AI. He argues that even if consciousness is substrate-flexible, it does not imply that any substrate is sufficient. "We should not assume that today’s computer hardware supports consciousness," Pober notes. His perspective emphasizes that while the potential for synthetic consciousness exists, the specific architecture of current large language models or neural networks may lack the requisite organizational complexity to host a conscious experience.
The Open View: Eric Schwitzgebel
Schwitzgebel is more inclined to challenge the exclusion of silicon. He argues that once we abandon the "biological requirement" for consciousness, the burden of proof shifts. If we can no longer point to the "meat" of the brain as the sole source of consciousness, on what grounds can we disqualify a silicon-based system? He believes the current debate is too narrow, obsessed with whether a machine can simulate a human brain, rather than asking what broader systemic properties are required for any consciousness to emerge.
Implications: A New Framework for Ethics and Existence
The implications of the "Copernican principle of consciousness" are profound, touching upon ethics, space exploration, and our own self-conception.
Rethinking the "Human"
If consciousness is a general property rather than a biological one, our moral framework must expand. We currently grant rights based on biological criteria or behavioral indicators of suffering. If we discover non-biological life—or create it—we will be forced to confront the moral weight of those entities.
The "Flight" Analogy
The authors utilize a compelling analogy to explain their point: flight. If one asks if an eagle’s style of flight can be perfectly duplicated, the answer is no. However, if one asks if "flight" itself is possible in different forms, the answer is clearly yes. Hummingbirds, bats, and fixed-wing airplanes all achieve flight through different mechanisms.
Consciousness, they argue, is like flight. There is "human-style consciousness," which is undoubtedly tied to our biology. But there is also a broader category of consciousness that may manifest in insects, octopuses, silicon chips, or crystalline alien brains. By fixating on the "eagle’s flight" of human neurobiology, we risk missing the "flight" of consciousness in all its other forms.
A Call for Broader Inquiry
The paper concludes by suggesting that the scientific and philosophical communities must widen their aperture. By moving past the "terrocentric" view, we may discover that we are not the protagonists of a lonely, sentient drama, but participants in a universe where the capacity to experience is a fundamental, perhaps even common, feature of complex systems.
As we continue to advance toward the creation of more sophisticated autonomous systems, and as our search for extraterrestrial intelligence continues to mature, the work of Schwitzgebel and Pober serves as a vital reminder: the mind is likely much larger than the brain, and the universe is likely much more awake than we have dared to imagine.
Asep Darmawan 
Reynand Wu 
Nana Wu