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Nagel’s Mind and Cosmos vs Searle’s Biological Naturalism

Nagel's Mind and Cosmos and Searle’s Biological Naturalism, compared field by field from their entries in the Atlas.

At a glance

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Challenge Nagel's Mind and Cosmos Thomas Nagel
Materialism Searle’s Biological Naturalism John Searle

The claim

In brief
Nagel’s Mind and CosmosThis perspective challenges the prevailing materialist Neo-Darwinian conception of nature, arguing that it fails to account for the irreducible nature of subjective experience, or 'what it is like' to be a conscious organism. It proposes that mind must be incorporated as a fundamental principle of nature itself.
Searle’s Biological NaturalismBiological Naturalism posits that consciousness is a real, irreducible, subjective biological feature of the brain, entirely caused by lower-level neurobiological processes and realized as higher-level system features. This approach seeks to solve the mind-body problem by accepting the scientific worldview while acknowledging the first-person ontology of conscious experience.
What consciousness is
Nagel’s Mind and CosmosConsciousness is fundamentally subjective experience—'how it is for the subject himself'—which resists reduction to purely physical, third-person descriptions.
Searle’s Biological NaturalismConscious states are identified as real parts of the real world that are higher-level, system features of the brain, defined as states of awareness, sentience, or feeling that persist during wakefulness.

Big questions

Can AI be conscious?Differ
Nagel’s Mind and CosmosUncertainAs a critique of functionalism and reductionism, Nagel's view suggests that purely computational entities lacking fundamental mental properties are likely philosophical zombies; outcome depends on whether future AI can instantiate the hypothesized universal mental principles.
Searle’s Biological NaturalismConditionalSearle rejects consciousness via simulation (Chinese Room Argument) but argues that if the causally sufficient biological mechanism is known, an artificial machine that implements that same mechanism could be conscious, as consciousness does not strictly require biological neurons, only sufficient causal power.
Does consciousness survive death?Differ
Nagel’s Mind and CosmosConditionalIf consciousness is a universal, fundamental property rather than a biological emergent, its essence may persist after bodily dissolution (inferred from panpsychist leanings), though likely without retention of personal identity.
Searle’s Biological NaturalismNoConsciousness is entirely physical and solely the product of biological brains; therefore, death of the brain and body means irrevocable, permanent non-existence.
Could a mind be uploaded?Differ
Nagel’s Mind and CosmosUnlikelyThe irreducibility of subjective experience means duplication of physical/functional patterns alone would fail to transfer the original first-person consciousness.
Searle’s Biological NaturalismYesIf consciousness is entirely explainable by physical/biological states, then duplicating those states (and their causal relations) in a non-biological medium would, in principle, allow for the uploading and continuation of the first-person mental self.
Does it give life meaning?Differ
Nagel’s Mind and CosmosCosmic/UltimateExplicitly seeks to incorporate mind as a fundamental natural principle to overcome the 'pointlessness' implied by materialism, suggesting a non-theistic, inherent cosmic purpose or value.
Searle’s Biological NaturalismHumanistic onlyAs a materialist theory, Biological Naturalism struggles to rationalize ultimate cosmic meaning or purpose, though humanistic meaning created by ourselves remains possible.

Nature of mind

Ontology
Nagel’s Mind and CosmosPhilosophical Challenge (leaning towards Universal Monism/Panpsychism)
Searle’s Biological NaturalismPhysicalism (Biological Naturalism). It holds that consciousness is part of nature as a subjective, qualitative biological property, rejecting attempts to 'naturalize' it by denying its subjective ontology.
Mind and body
Nagel’s Mind and CosmosCritiques the current conception of the mind-body relationship, asserting that we lack any conception of how physical and phenomenological aspects could be related or identical.
Searle’s Biological NaturalismConscious states are causally reduced to lower-level brain processes (causal reducibility), but are ontologically irreducible to these processes because consciousness has a subjective (first-person) ontology while its basis has an objective (third-person) ontology.
Fundamental or emergent
Nagel’s Mind and CosmosPrimitive (or fundamental)
Searle’s Biological NaturalismEmergent
Qualia
Nagel’s Mind and CosmosQualia (felt qualities) are the core of the problem, and Nagel argues that no objective or physicalist explanation currently formulated can account for their subjective reality.
Searle’s Biological NaturalismConscious states are inherently qualitative, in the sense that there is a distinct qualitative feel to being in any particular conscious state, and this qualitative feel is a real and irreducible part of the world.

How it works

Mechanism
Nagel’s Mind and CosmosPrimarily focuses on exposing the conceptual limits of physical reductionism rather than positing a definitive mechanism. Mechanistically, his solution suggests consciousness arises through the composition of fundamental, panpsychic-like elements.
Searle’s Biological NaturalismThe principle is that all conscious states are reliably and universally caused by lower-level brain processes and realized as system features, functioning as a real biological machine.
Where it is
Nagel’s Mind and CosmosUniversal/Systemic (inferred from universal monism/panpsychism leanings) or inherent in the fabric of nature.
Searle’s Biological NaturalismLocalized in the biological brain, specifically realized in the brain as higher-level or system features.
What it does
Nagel’s Mind and CosmosPrimarily critical, arguing against the materialist view that consciousness is an inert epiphenomenon. If mind is a fundamental principle, it implies an irreducible, organizing role in the cosmos.
Searle’s Biological NaturalismConscious states function causally (causal efficacy) as real parts of the real world, providing a basis for intentional action and interaction with the environment.

Evidence and criticism

Testability
Nagel’s Mind and CosmosUncertain/Primarily Conceptual. The theory's strength lies in its diagnosis of the explanatory gap, not in empirical verification. His suggested alternative (panpsychism) is highly speculative.
Searle’s Biological NaturalismEmpirically testable in principle, as the theory requires finding the exact causal details of how lower-level brain processes cause consciousness.
Tests so far
Nagel’s Mind and CosmosNot stated
Searle’s Biological NaturalismThe theory is generally supported by empirical evidence from neuroscience showing the link between consciousness and brain activity (e.g., brain impairment, brain stimulation).
Criticisms
Nagel’s Mind and CosmosCriticized for retreating to 'mysterianism' and for rejecting established scientific frameworks (Neo-Darwinian materialism) without offering a concrete, robust, and detailed secular ontology as an alternative.
Searle’s Biological NaturalismCritics dispute the claim that the causal connection between brain states and consciousness is fully established. Tension exists in maintaining materialism while arguing consciousness is ontologically subjective and irreducible to objective physical processes.

Sources

Key sources
Nagel’s Mind and Cosmos
  • What Is It Like to Be a Bat? (1974)
  • The View from Nowhere (1986)
  • Mind & Cosmos: Why the Materialist Neo-Darwinian Conception of Nature Is Almost Certainly False (2012)
Searle’s Biological Naturalism
  • The Rediscovery of Mind (1992)
  • Biological naturalism (2007)
  • What things are conscious? (2007)

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