Head to head
Descartes’s Substance Dualism vs Emergence
Descartes’s Substance Dualism and Emergence (Principle of Consciousness), compared field by field from their entries in the Atlas.
At a glance
- Descartes’s Substance Dualism belongs to the Dualism family in Kuhn's Landscape of Consciousness, Emergence to Materialism.
- Descartes’s Substance Dualism treats consciousness as fundamental; Emergence treats it as emergent.
- On AI consciousness, Descartes’s Substance Dualism says “No” and Emergence says “Conditional”.
- On life after death, Descartes’s Substance Dualism says “Yes” and Emergence says “Conditional”.
- On mind uploading, Descartes’s Substance Dualism says “No” and Emergence says “Conditional”.
- On meaning and purpose, Descartes’s Substance Dualism says “Cosmic/Ultimate” and Emergence says “Uncertain”.
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The claim
In brief
Descartes’s Substance DualismRené Descartes holds that consciousness, which he calls thought (cogitatio), is the essence of an immaterial thinking substance (res cogitans) wholly distinct from extended, mechanical body (res extensa). Every conscious state, from reasoning and willing to pain, color, and emotion, is a mode of the thinking thing and is immediately present to it. Sensations and passions, though, arise only in the union of mind and body, where brain processes stand in regular relations to experiences they do not resemble.
EmergenceEmergence is the philosophical claim that qualitatively new properties, such as consciousness or psychological states, arise from underlying physical properties governed entirely by physical laws. It is distinguished primarily into weak emergence, which is reducible in principle, and strong emergence, which is fundamentally non-reducible and may necessitate new physical laws.
What consciousness is
Descartes’s Substance DualismConsciousness is thought, defined as everything that happens within us insofar as we are immediately conscious of it, and it is the principal attribute of the mind.
EmergenceConsciousness is identified as a qualitatively novel property or psychological state arising from physical properties. This concept defines the relationship between mind and matter based on reducibility or non-reducibility to fundamental physics.
Big questions
Can AI be conscious?Differ
Descartes’s Substance DualismNoSince thought belongs only to immaterial substance and matter is pure extension, a machine, however complex, would be mechanism without a mind.
EmergenceConditionalIf consciousness is weakly emergent, AI consciousness is certain given sufficient complexity. If strongly emergent, AI consciousness is still possible if non-physical properties emerge from non-biological physical complexity, depending on the meta-psychophysical laws involved.
Descartes’s Substance DualismYesDescartes presented the real distinction of soul and body as what makes the soul’s survival intelligible, and the Meditations announce that aim in their subtitle.
EmergenceConditionalWeak emergence, being close to Materialism, precludes survival. Strong emergence, particularly in the form of Emergent Dualism, could theoretically generate a nonphysical substance (mind/soul) dependent on, but not strictly identical to, the physical brain, allowing for potential independent existence after death, although this is speculative.
Descartes’s Substance DualismNoCopying the body’s mechanism would not copy the immaterial thinking substance.
EmergenceConditionalIf consciousness is weakly emergent, duplicating the physical states would duplicate the mental states (likely). If strongly emergent, the non-reducible properties and possible downward causation would need to be perfectly captured and recreated in the new medium, posing significant, perhaps insurmountable, technical and conceptual challenges.
Descartes’s Substance DualismCosmic/UltimateDescartes’s system rests on a non-deceiving God who guarantees knowledge and created even the eternal truths.
EmergenceUncertainEmergence, especially strong emergence combined with concepts like top-down causation, offers a framework where higher-level properties like consciousness and its associated values could possess genuine causal power, potentially supporting cosmic purpose or meaning, depending on the resulting ontology.
Nature of mind
Ontology
Descartes’s Substance DualismSubstance dualism (Cartesian)
EmergenceHighly variable/Contested. Weak Emergence supports reductive Physicalism. Strong Emergence often implies Non-Reductive Physicalism or a need to expand the conception of nature, potentially requiring new fundamental laws (Naturalistic Dualism or Property Dualism).
Mind and body
Descartes’s Substance DualismMind and body are really distinct finite substances with exclusive essences, thought and extension, and could by divine power exist apart. They are joined in the human being, where bodily motions give rise to sensations and the mind moves the body, though Descartes never explained that interaction satisfactorily.
EmergenceEmergentist. The mind arises from the body (complex physical systems). The nature of the relationship depends on the type of emergence: Weak suggests reduction in principle; Strong suggests non-reducibility even in principle, often involving downward causation.
Fundamental or emergent
Descartes’s Substance DualismPrimitive
EmergenceEmergent
Qualia
Descartes’s Substance DualismSensory qualities are not properties of matter, which has only size, shape, motion, and arrangement. Experienced redness or pain is a mental mode arising in the embodied union and cannot be captured by extension.
EmergenceQualia are the novel, qualitatively new properties (e.g., sensory qualities) that arise from the physical system. Strong emergence views consciousness (and thus qualia) as the clearest case of a strongly emergent phenomenon, fundamentally irreducible to underlying physical facts.
How it works
Mechanism
Descartes’s Substance DualismMechanism on the bodily side and non-reduction on the mental side. Light mechanically affects eyes, nerves, and brain, and the mind then experiences color, distance, and shape in regular correspondence with those motions.
EmergenceThe principle is the claim that novel, qualitatively distinct properties arise at higher levels of complexity, which is often contrasted with the reductive assumptions of mainstream science.
Where it is
Descartes’s Substance DualismThe mind is unextended. Sensations and passions are felt as belonging to one’s own body, and Descartes located mind-brain communication in the pineal gland.
EmergenceTypically localized in complex biological systems (e.g., brains), although strong emergence proponents may argue that AI consciousness is possible if sufficient physical complexity is achieved, regardless of substrate.
What it does
Descartes’s Substance DualismPassions are caused and strengthened by movements of the animal spirits and dispose the soul toward volition and action. The will can in turn move the body.
EmergenceVaries. Weak emergence aligns with standard physical causation. Strong emergence often posits top-down causation, where emergent higher hierarchical levels exert causal force on lower levels, giving the emergent property causal powers.
Evidence and criticism
Testability
Descartes’s Substance DualismConceptually testable
EmergenceSpeculative and philosophically contentious. Weak emergence is scientifically aligned in principle. Strong emergence is difficult to test empirically because it posits phenomena are non-deducible from fundamental science.
Tests so far
Descartes’s Substance DualismNot stated
EmergenceNot stated
Criticisms
Descartes’s Substance DualismPrincess Elisabeth of Bohemia asked how an immaterial soul could move a material body, and the interaction problem remains unresolved. Arnauld and later critics charged circularity, since the proofs of God that guarantee clear and distinct perception themselves rely on clear and distinct perception. The standard reading denies consciousness to animals, which most now find implausible.
EmergenceIt is criticized by reductive physicalists (like Eliminative Materialists) as having little explanatory value, being superfluous, or acting as a 'restatement of a miracle' that fails to explain *how* unconscious complexity yields consciousness. Strong emergence specifically challenges the causal closure of the physical world.
Sources
Key sources
Descartes’s Substance Dualism
- Meditations on First Philosophy, René Descartes (trans. J. Cottingham, R. Stoothoff, and D. Murdoch) (1984)
- Principles of Philosophy, René Descartes (trans. J. Cottingham, R. Stoothoff, and D. Murdoch) (1985)
- The Passions of the Soul, René Descartes (trans. J. Cottingham, R. Stoothoff, and D. Murdoch) (1985)
Emergence
- The Re-emergence of Emergence: the Emergentist Hypothesis from Science to Religion, P. Clayton and P. Davies (2008)
- Strong and weak emergence, D. Chalmers (2008)
- Why reductionism does not work, G.F.R. Ellis (2019)
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