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John Tooby (1952–2023)

Tooby was an evolutionary anthropologist and biologist who, with Leda Cosmides, built the theoretical framework of evolutionary psychology. Where Cosmides contributed the experimental programme (the cheater-detection experiments, the Wason selection task), Tooby contributed the biological and theoretical architecture: the concept of the environment of evolutionary adaptedness (EEA), the critique of the Standard Social Science Model (SSSM), and the argument that the mind’s architecture is a product of natural selection operating on ancestral problems. The Adapted Mind (1992) is the joint programmatic statement. Tooby’s theoretical contributions give the field its conceptual foundations — its claims about what the mind is (a collection of evolved, domain-specific modules), what it is for (solving recurrent adaptive problems), and what the alternative (the SSSM) gets wrong.

Life

Born 1952. Undergraduate at Harvard. PhD in biological anthropology at Harvard (1989), under Irven DeVore, a primatologist and human behavioural ecologist. The training in biological anthropology — evolutionary theory applied to human behaviour, primate ecology, hunter-gatherer studies — gave Tooby the biological grounding that distinguishes evolutionary psychology from earlier attempts to apply evolution to human behaviour (sociobiology, ethology).

Professor of anthropology at the University of California, Santa Barbara (1990–2023), where he and Cosmides co-directed the Center for Evolutionary Psychology. Tooby was the more theoretically ambitious of the two — his papers develop the conceptual architecture of the field, argue for its necessity, and engage with its critics at the foundational level. Died 17 November 2023 in Santa Barbara.

The theoretical framework

The environment of evolutionary adaptedness (EEA). The mind’s evolved architecture was shaped not by the modern world but by the ancestral environments in which human ancestors lived for the vast majority of evolutionary history — primarily the Pleistocene (roughly 2.6 million to 12,000 years ago). The EEA is not a single place or time but a statistical composite: the set of selection pressures that recurred with sufficient frequency and duration to shape the design of cognitive mechanisms. The concept does not require detailed reconstruction of any specific ancestral environment; it requires only that certain problems (finding food, avoiding predators, maintaining alliances, detecting cheaters, selecting mates) were recurrent and fitness-relevant.

The critique of the Standard Social Science Model. Tooby and Cosmides argued in their introductory chapter to The Adapted Mind that the dominant model in the social sciences — the SSSM — treats the mind as a general-purpose learning device, blank at birth, shaped entirely by socialisation and culture. The SSSM, they argued, is both empirically false (the mind has evolved structure that shapes what and how we learn) and conceptually incoherent (a genuinely blank device could not learn anything, because learning requires innate structure to guide it). The critique was intended to clear the ground for an alternative: a mind with rich, evolved, domain-specific structure.

Massive modularity. Tooby’s theoretical argument for why the mind must be modular: a general-purpose mechanism cannot solve all adaptive problems efficiently, because different problems have different computational requirements. A device that detects visual edges needs different algorithms from a device that navigates social hierarchies. Natural selection produces specialised solutions to specific problems — just as the body has specialised organs (hearts, livers, kidneys), the mind has specialised cognitive mechanisms. The analogy is explicit and load-bearing for the theoretical framework.

Where Tooby stops

The EEA concept has been pressed on two fronts. Empirically: the Pleistocene is poorly documented, and the selection pressures Tooby postulates are inferred from the cognitive mechanisms they are supposed to explain, creating a circularity risk — the mechanism is evidence for the selection pressure, and the selection pressure explains the mechanism. Buller argued that this circularity is endemic to evolutionary psychology’s adaptationist claims. Theoretically: the EEA concept assumes that the human environment was stable enough over evolutionary time for selection to shape specialised modules, but if environments were variable (as the archaeological evidence increasingly suggests), a more flexible cognitive architecture might have been favoured — an argument developed by Cecilia Heyes in Cognitive Gadgets (2018), which proposes that many of the capacities evolutionary psychology attributes to genetic evolution are actually products of cultural evolution.

The SSSM critique was effective as a polemic but has been challenged as a straw man. Few social scientists actually hold the extreme blank-slate position Tooby and Cosmides attributed to the SSSM. The productive debate is about the extent and specificity of innate endowment — not whether the mind has evolved structure (virtually no one denies this) but whether the structure is best described as domain-specific modules or as more general-purpose learning mechanisms that produce domain-specific behaviour through interaction with the environment. The blank-slate framing sharpened the political debate but may have obscured the scientific one.

The massive-modularity thesis — the mind as a collection of domain-specific modules with no domain-general centre — faces Fodor’s central-cognition objection: the most interesting cognitive capacities (analogical reasoning, creative problem-solving, abstract thought) resist modular decomposition. Tooby argued that even apparently domain-general capacities are underwritten by domain-specific mechanisms working in coordination, but the argument is programmatic rather than demonstrated — the specific modular architecture of central cognition has not been identified.

Key works

See also: Cosmides · Pinker · Sperber · Darwinism