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Jerry Fodor (1935–2017)

Fodor was a philosopher of mind and cognitive scientist whose work centred on two claims: that the mind has a modular architecture — specialised, encapsulated systems for particular tasks (vision, language, face recognition) that operate independently of central cognition — and that thought has a language-like structure (the language of thought hypothesis). These claims made him one of the architects of the computational theory of mind that dominated cognitive science from the 1970s through the 1990s. He was also, in his later career, one of the sharpest critics of adaptationist reasoning in biology and psychology — arguing that evolutionary psychology’s “massive modularity” thesis (the mind as a collection of domain-specific adaptations) overstates both what natural selection can explain and what modularity amounts to. The combination made Fodor an unusual figure: a leading proponent of computational cognitive science who attacked the evolutionary framework that many computational cognitive scientists adopted.

Life

Born 22 April 1935 in New York City. Undergraduate at Columbia University (BA, 1956). PhD in philosophy at Princeton (1960), under Hilary Putnam — a connection that shaped Fodor’s early functionalism (the idea that mental states are defined by their causal roles, not their physical composition). Taught at MIT (1959–86), then at the City University of New York Graduate Center (1986–88), then at Rutgers University (1988–2016), where he was State of New Jersey Professor of Philosophy.

Fodor was a prolific and combative writer — his style was direct, often funny, and frequently polemical. He wrote for a professional philosophical audience but was read more broadly in cognitive science, linguistics, and psychology. His willingness to attack entire research programmes — connectionism, evolutionary psychology, pragmatism — in sharp, argumentative prose made him one of the most visible philosophers in cognitive science, admired and resented in roughly equal measure. Died 29 November 2017 in New York.

The modularity of mind

The Modularity of Mind (1983) is Fodor’s most influential book. It argues that the mind contains specialised input systems — modules — that process information from the senses and deliver representations to a central cognitive system. Modules have distinctive properties:

Domain specificity. Each module processes a specific type of information (visual, auditory, linguistic) and cannot be redeployed for other tasks. The language module processes speech sounds; it does not process faces.

Informational encapsulation. Modules operate without access to information held by other modules or by central cognition. What you know does not affect what you see: the Müller-Lyer illusion persists even when you know the lines are equal. Encapsulation is the property that makes modules fast and mandatory — they deliver their outputs automatically, without waiting for instructions from above.

Mandatory, fast, and shallow. Modules fire automatically when presented with their input type. They are fast because they are encapsulated (they don’t need to consult everything the organism knows). Their outputs are shallow — perceptual representations, not beliefs or decisions.

The critical distinction in Modularity is between input systems (modular) and central cognition (not modular). Fodor argued that central cognition — belief fixation, reasoning, decision-making — is not modular: it is domain-general, informationally unencapsulated, and slow. The difficulty of understanding central cognition is, for Fodor, the hardest problem in cognitive science — and one he suspected might be intractable.

The language of thought

The Language of Thought (1975) argues that thinking is computation over mental representations that have a language-like structure — a syntax (combinatorial structure) and a semantics (representational content). The hypothesis is not that we think in English or any natural language, but that the mental representations over which cognitive processes operate have the structural properties of a language: they are composed of parts, the parts combine according to rules, and the meaning of the whole is determined by the meanings of the parts and the rules of combination (compositionality).

The hypothesis explains productivity (we can think an unlimited number of thoughts from finite resources), systematicity (anyone who can think “John loves Mary” can think “Mary loves John”), and the relationship between language and thought (natural language expresses pre-existing thought rather than constituting it). Fodor defended the language of thought throughout his career, against connectionist models (which represent information in distributed patterns rather than discrete symbols) and against pragmatist and enactivist approaches that reject the representational framework altogether.

The critique of adaptationism

Fodor’s later work turned to the philosophy of biology. The Mind Doesn’t Work That Way (2000) — a direct response to Pinker’s How the Mind Works — argued that evolutionary psychology’s “massive modularity” thesis is wrong. The thesis claims that the mind is composed entirely of domain-specific modules, each an adaptation shaped by natural selection for a specific ancestral problem. Fodor objected on two grounds:

Against massive modularity. Fodor’s original modularity thesis applied to input systems, not to central cognition. Evolutionary psychology extends modularity to the entire mind — cheater-detection modules, mate-selection modules, threat-assessment modules. Fodor argued that this extension is unjustified: central cognitive processes (abductive inference, analogy, creative problem-solving) are precisely the capacities that resist modular decomposition. If the interesting cognitive work happens in unencapsulated, domain-general processes, then modularity explains the periphery of the mind, not its centre.

Against adaptationism. What Darwin Got Wrong (2010, with Massimo Piattelli-Palmarini) extended the critique from psychology to biology. Fodor and Piattelli-Palmarini argued that natural selection cannot do the explanatory work adaptationism claims for it, because selection cannot distinguish between traits and their correlated properties — the selection-for/selection-of problem that Sober had analysed. The book was widely criticised by biologists and philosophers of biology, who argued that Fodor had misunderstood the structure of selectionist explanation. Dennett, Lewontin, and Elliot Sober all rejected the argument, though for different reasons. The book is the most contested work of Fodor’s career.

Where Fodor stops

The modularity thesis in its original form — input systems are modular, central cognition is not — has been productive, but it leaves the hard problem untouched. Fodor acknowledged this explicitly: central cognition (how we form beliefs, make decisions, and reason abductively) is the core of the mind, and it is exactly the part the modularity thesis does not explain. The computational theory of mind explains what modules do; it does not explain what happens when the modules have delivered their outputs and the central system must decide what to believe. Fodor’s own summary was characteristically blunt: “The more global … a cognitive process is, the less anybody understands it. Very global ones — like analogical reasoning — are utterly beyond the scope of anything that anybody’s thought of so far.” He called this pattern “Fodor’s First Law of the Nonexistence of Cognitive Science.”

The language-of-thought hypothesis has been challenged by connectionist and dynamicist approaches that model cognition without discrete, language-like representations. Paul Smolensky and others have argued that the symbolic representations Fodor posits are emergent properties of distributed processes, not fundamental constituents of thought. Fodor maintained throughout his career that these alternatives cannot explain productivity and systematicity without covertly implementing a language of thought. The debate is unresolved; the rise of deep learning and large language models has complicated it further by demonstrating impressive cognitive-like performance in systems that are neither classically symbolic nor Fodorian in architecture.

The adaptationism critique in What Darwin Got Wrong was Fodor’s least successful intervention. The philosophical community largely agreed with the biologists’ response: that Fodor had misidentified the structure of selectionist explanation and that the selection-for/selection-of problem, while real (Sober had diagnosed it carefully), does not undermine natural selection as an explanatory framework. The book illustrates a risk of Fodor’s combative style: the willingness to attack an entire discipline’s foundations is productive when the critique is well-targeted (as with massive modularity) and counterproductive when it rests on a misunderstanding of the target (as the biological community judged this case to be).

Key works

See also: Putnam · Dennett · Sober · Darwinism