Quine’s Naturalized Mind and the Demoted Phenomenal

Philosopher W. V. O. Quine did not construct a dedicated theory of phenomenal consciousness; rather, a position emerges from his naturalism, physicalism, philosophy of language, and naturalized epistemology. Consciousness is real but wholly bodily—a condition of the nervous system—while particular mental events are identical with physical events even when mental classifications cannot be reduced to neurological classifications. His account explains how sensory stimulation, behavioral dispositions, and public language support knowledge and mental attribution, but leaves unexplained why neural activity has subjective, qualitative character (Quine, 1960, 1969, 1975, 1987, 1990).

Quine not only produced no theory of consciousness but also treated the topic only glancingly, yet his thoroughgoing naturalism carries a definite and influential stance toward phenomenal consciousness: it demotes the phenomenal from epistemic and ontological foundation to a late, derivative, second-grade “idiom.” Quine is a physicalist who, having reconstrued behavioral dispositions as physiological states, arrives at what he calls the identity theory of mind—"mental states are states of the body" (Quine, 1975)—though his anti-essentialism gives this physicalism a behavioristic rather than a type-reductive cast. On the epistemic side, his naturalized epistemology begins not with a private stream of experience but with a physical organism whose sensory surfaces are triggered by impacts from a public world (Quine, 1969), so that talk of subjective sense qualities arises "mainly as a derivative idiom," parasitic on the intersubjectively observable (Quine, 1960). The upshot for consciousness studies is a framework in which qualia are neither denied nor explained but marginalized: real as bodily states, yet excluded from the extensional language in which Quine holds that the true structure of reality must be depicted.

Naturalism Without First Philosophy

Quine’s point of departure is methodological: philosophy possesses no standpoint outside science from which to account for the nature of mind. Epistemology is not prior to natural science but a chapter of it—the study of how a physical subject, "bombarded" by sensory stimulation, projects a theory of the world (Quine, 1969). This reversal matters for consciousness because it inverts the Cartesian and phenomenalist order of dependence. Where a phenomenalist takes private experience as the given and the physical world as construction, Quine takes the physical subject and its public environment as basic, and treats sensory awareness as neural response to "surface irritations." The starting point is the observation sentence, keyed to shared, publicly checkable circumstances of assent, not to introspectible inner episodes. Consciousness, on this picture, is not the epistemically secure foundation of knowledge but one more natural phenomenon to be studied from outside, third-personally, by the science it helps produce.

Reality is to be identified within our evolving best science, with psychology continuous with biology and physics rather than grounded in irrefutable introspection (Quine, 1969, 1981, 1995). The mind–body problem therefore cannot be resolved through conceptual analysis alone. Physicalism remains the default scientific hypothesis, and Quine favors it for its continuity with established science and ontological parsimony (Hylton and Kemp, 2023; Janssen-Lauret, 2019).

As noted, this naturalism rejects Cartesian mental substance and the epistemological primacy of private experience, but Quine’s approach does not entail eliminativism—Quine explicitly denies dismissing consciousness, calling it a genuine mystery while maintaining that, “whatever it precisely may be,” it is a bodily and neural state (Quine, 1987). His position is physicalist without being explanatorily peremptory.

Mental States as States of the Body

Quine's positive ontology of mind is austere token physicalism. He grants that there are mental states, but takes them to be states of the organism, ultimately physiological, rather than states of a second substance or occupants of an autonomous mental domain (Quine, 1975). His behaviorism is, by his own account, methodological rather than a denial of inner life: dispositions to behave are the evidential handle on the mental, and those dispositions are in turn physical states of neuronal activities. Quine identifies each particular occurrence of thinking, perceiving, feeling, or remembering with a physical event in an organism. An episode of thinking about Fermat’s Last Theorem is not accompanied by a separate mental entity; it is the organism’s physical state described under a mental predicate.

This is token identity rather than classical type identity: instances of one mental kind need not share a single repeatable neural type (Quine, 1960, 1995; Hylton and Kemp, 2023). This yields a mind-body identity without essences—no claim that each mental type maps onto a single physical type, only that each mental state, being a state of the body, is physical.

His mature formulation approaches anomalous monism. There is no mental substance, but there are “irreducibly mental ways of grouping physical states and events” (Quine, 1990). Mental and physical vocabularies may classify the same occurrences according to different explanatory interests, without strict laws translating every psychological kind into a neurological kind. In this respect, Quine sits close to Davidson's anomalous monism, with which he is often paired, but is more deflationary: he grants the mental far less autonomy as a conceptual domain and tolerates mentalistic vocabulary chiefly for its practical indispensability. Quine’s view evolved: in his 1980 Kant lectures he still entertained uniquely specifiable neurological realizations for perceptual events, but by Pursuit of Truth extended irreducible mental classification to perception as well as belief (Quine, 1980/2019, 1990; Janssen-Lauret, 2019).

Language and the Extensional Ideal

The instrument of this demotion is Quine's philosophy of language. Because intensional and mentalistic idioms—belief, desire, meaning, and the felt characters ascribed in introspective report—are referentially opaque, resisting the substitution of co-referring terms, they violate the extensionality Quine demands of any language that limns the true structure of reality; the intensions they invoke he dismissed as "creatures of darkness" lacking criteria of identity, and consigned to a merely "second grade" of idiom, serviceable for daily life but barred from serious ontology (Quine, 1960). Subjective sense qualities fare no better: they are, for Quine, a derivative idiom, described only by reaching outward to public comparisons—a color as orange or heliotrope, a smell as of rotten eggs—so that even the language of the inner is built from public reference, and sense data emerge not as the bedrock of experience but as a late, physicalism-laden construction. This is deflation, not elimination: the qualitative is genuine, but its vocabulary is secondary. Because this linguistic machinery is where Quine's treatment of consciousness is most distinctive, it is developed in full in the companion entry, "Quine's Linguistic Demotion of Phenomenal Consciousness," in the Landscape's Language Relationships subcategory.

Placement and Assessment

In Landscape, Quine could be miscategorized under Materialism → Eliminative/Illusionism (with Churchland, Dennett, Frankish, etc.), because "demotes qualia" pattern-matches to that group. That would be an error, and the entry argues against it explicitly: Quine never denies qualia or calls consciousness an illusion; he accepts mental states as bodily states and treats sense-quality talk as a legitimate if derivative idiom. He is a deflationary physicalist, not an eliminativist.

Quine's significance for consciousness studies is thus programmatic rather than explanatory. He offers no account of why neural states are felt, and would likely regard the demand for one as shaped by the very intentional intuitions his naturalism sets aside. Placed primarily among the philosophical materialisms for his identity thesis, and secondarily among the Language Relationships theories for the linguistic machinery through which he demotes the inner, his legacy is a single disciplined framework—physicalist, extensionalist, third-personal—within which the hard problem does not so much get solved as get relocated to the disreputable side of a methodological boundary. Whether that relocation is a dissolution or an evasion remains, for his critics and each theorist, the open question.

References

Hylton, P., & Kemp, G. (2023). “Willard Van Orman Quine.” In E. N. Zalta and U. Nodelman (eds.), The Stanford Encyclopedia of Philosophy. Stanford: Metaphysics Research Lab, Stanford University.

Janssen-Lauret, F. (2019). “Quine, Ontology, and Physicalism.” In R. Sinclair (ed.), Science and Sensibilia by W. V. Quine: The 1980 Immanuel Kant Lectures, 181–204. Cham: Palgrave Macmillan.

Landscape of Consciousness. (2026a). “Non-Reductive Physicalism—Overview.” Landscape of Consciousness. The Kuhn Foundation.

Landscape of Consciousness. (2026b). “Davidson’s Anomalous Monism.” Landscape of Consciousness. The Kuhn Foundation.

Quine, W. V. O. (1960). Word and Object. Cambridge, MA: MIT Press.

Quine, W. V. O. (1969). “Epistemology Naturalized.” In Ontological Relativity and Other Essays, 69–90. New York: Columbia University Press.

Quine, W. V. O. (1974). The Roots of Reference. La Salle, IL: Open Court.

Quine, W. V. O. (1975). “Mind and Verbal Dispositions.” In S. Guttenplan (ed.), Mind and Language, 83–95. Oxford: Clarendon Press.

Quine, W. V. O. (1981). Theories and Things. Cambridge, MA: Harvard University Press.

Quine, W. V. O. (1986). “Reply to Hilary Putnam.” In L. E. Hahn and P. A. Schilpp (eds.), The Philosophy of W. V. Quine, 427–431. La Salle, IL: Open Court.

Quine, W. V. O. (1987). Quiddities: An Intermittently Philosophical Dictionary. Cambridge, MA: Harvard University Press.

Quine, W. V. O. (1990). Pursuit of Truth. Cambridge, MA: Harvard University Press.

Quine, W. V. O. (1995). From Stimulus to Science. Cambridge, MA: Harvard University Press.

Quine, W. V. O. (2019). Science and Sensibilia: The 1980 Immanuel Kant Lectures. R. Sinclair (ed.). Cham: Palgrave Macmillan. Lectures delivered 1980.