Philosophy and science share a common starting point: a question with no obvious answer. What is knowledge? Does nature obey fixed laws? Can a computer program reason morally? These great questions of philosophy and science traverse the centuries, but their formulations change as tools of observation and thought improve.
Philosophy and science facing the same questions: mapping the gaps
Some inquiries are claimed by both philosophers and scientists. The difference lies not in the subject, but in the method and the type of answer expected. The table below compares some major common questions and how each discipline approaches them.
| Question | Philosophical approach | Scientific approach |
|---|---|---|
| What is consciousness? | Conceptual analysis, phenomenology, debate on mind-body dualism | Neuroscience, brain imaging, neural correlates |
| Does the world have a beginning? | Metaphysics, rational cosmology (Kant, Leibniz) | Physical cosmology, Big Bang models, cosmic background radiation |
| Can we know the truth? | Epistemology, skepticism, theories of justification | Experimental method, falsifiability, reproducibility |
| Is morality universal? | Normative ethics, relativism, categorical imperative | Moral psychology, cross-cultural studies, social neuroscience |
| Can a non-human agent be moral? | Philosophy of action, conditions of agency | AI research, ethical alignment models |
What emerges from this comparison: science seeks verifiable mechanisms, while philosophy questions the assumptions behind these mechanisms. Both disciplines complement each other without replacing one another.
Resources like sciencesphilo.fr allow for the exploration of these intersections between philosophical thought and scientific approach, without compartmentalizing knowledge.
Epistemology and scientific demarcation: where does science end?
Among the most structuring philosophical questions for science, the question of demarcation holds a special place. It involves drawing a line between what falls under science and what does not.
Karl Popper proposed a classic criterion: a theory is scientific if it is falsifiable, meaning that one can conceive an observation that would refute it. A statement that withstands all possible refutation (because it is too vague or adapts to everything) falls outside the scientific realm.
Thomas Kuhn and scientific revolutions
Thomas Kuhn nuanced this view by showing that science does not progress linearly. It operates through paradigms: theoretical frameworks accepted by the community at a given time. When anomalies accumulate, a new paradigm eventually replaces the old one. This process, which Kuhn calls a scientific revolution, changes not only the answers but also the questions considered legitimate.
Epistemology thus does not merely observe science from the outside. It influences how scientists evaluate their own results, prioritize evidence, and define what counts as a valid explanation.
Knowledge, truth, and the limits of human thought
The question of truth runs throughout the history of philosophy. It takes on a particular resonance today in light of the proliferation of information sources and the growing difficulty of distinguishing the reliable from the dubious.
Three approaches have long coexisted:
- The correspondence theory: a proposition is true if it corresponds to a state of affairs in the world. This is the most intuitive approach, but it assumes that one can directly access reality, which several philosophers contest.
- The coherence theory: a proposition is true if it fits without contradiction into a set of already accepted propositions. This approach works well for mathematics and formal logic.
- Pragmatism: a proposition is true if it works, meaning it produces reliable results in practice. William James and Charles Sanders Peirce defended this position.
None of these three approaches has definitively supplanted the others. Truth remains a philosophically open concept, even when science produces reproducible and predictive results.
The problem of induction
David Hume posed a formidable problem: nothing logically guarantees that the future will resemble the past. Observing a thousand white swans does not prove that the next one will be white. Science relies heavily on induction (generalizing from repeated observations), but this method has no absolute logical foundation. This paradox has never been definitively resolved, and it continues to fuel the debate between philosophers and scientists.
Artificial intelligence and moral philosophy: can a non-human agent be moral?
Artificial intelligence has revived a question that classical philosophy reserved for humans and, in some traditions, for animals: who can be a moral agent?
A moral agent, in the strict sense, is a being capable of deliberation, choosing based on values, and assuming responsibility for its actions. The complete ethical alignment of AI with human values remains conceptually impossible as long as these systems do not possess conditions of existence comparable to ours: a body, experiences, social integration.
UNESCO adopted a Recommendation on the ethics of artificial intelligence in November 2021, which has become a global reference and is regularly updated. This text transforms questions once reserved for philosophy seminars into public policy issues:
- How far can we automate without undermining human dignity?
- How can we reconcile algorithmic transparency and privacy protection?
- How can we integrate fairness and non-discrimination into systems that learn from historically biased data?
In just a few years, the question “Can we program morality?” has shifted to a more radical inquiry: can an agent devoid of subjectivity attain the status of a moral agent in the strong sense? The philosophy of action and AI research converge here without having found a shared answer.
The great questions of philosophy and science do not fit into separate drawers. Scientific demarcation draws from epistemology, truth engages both logicians and physicists, and AI ethics compels lawyers, engineers, and philosophers to work on the same texts. The next major scientific advancement will likely pose a philosophical question that no one has yet formulated.
