Home > Positioning > Persons > Henrich

Joseph Henrich (1968–)

Henrich argued that what makes humans ecologically dominant is not individual intelligence but cumulative culture — the ability to build on and improve the innovations of previous generations, producing a body of adaptive knowledge that no individual could discover alone. The Secret of Our Success (2015) presents the case: humans survive in diverse environments not because they are individually smarter than other animals but because cultural learning accumulates solutions across generations — solutions to problems of food processing, tool manufacture, navigation, medicine, and social organisation that are too complex for any individual to rediscover from scratch. The argument extends the Boyd–Richerson dual-inheritance framework into a broader claim about human cognition: our brains evolved not primarily for individual problem-solving but for cultural learning — for acquiring, storing, and transmitting the accumulated knowledge of the group.

Life

Born 1968 in Abbotsford, British Columbia, Canada. Undergraduate at the University of Notre Dame. PhD in anthropology at UCLA (1999), under Robert Boyd — extending the Boyd-Richerson programme into empirical fieldwork and cross-cultural experimental economics. Postdoctoral work at Emory University. Professor of psychology and economics at the University of British Columbia (2006–2020). Professor of human evolutionary biology at Harvard (2020–), where he chairs the Department of Human Evolutionary Biology.

Henrich’s distinctive methodological contribution is the combination of formal cultural-evolution theory with large-scale cross-cultural experiments. His fieldwork spans fifteen societies across five continents — from Machiguenga horticulturalists in Peru to Mapuche farmers in Chile to Hadza foragers in Tanzania — testing economic-game behaviour (ultimatum games, dictator games, public-goods games) across populations with radically different social structures. The cross-cultural experimental programme has been one of the most productive empirical research streams in cultural evolution.

Cumulative culture and the cultural brain

The Secret of Our Success: How Culture Is Driving Human Evolution, Domesticating Our Species, and Making Us Smarter (2015) argues that the key to human ecological success is not raw intelligence but the capacity for high-fidelity cultural transmission. Humans are “cultural species” — not in the loose sense that culture matters, but in the specific sense that our cognitive architecture evolved to make cultural learning possible and efficient.

The evidence: humans placed in unfamiliar environments without access to culturally accumulated knowledge perform poorly. European explorers in Australia, the Arctic, and the Amazon regularly died of starvation or exposure in environments where indigenous populations thrived — not because the explorers were less intelligent but because they lacked the culturally transmitted knowledge (food-processing techniques, seasonal-movement patterns, medicinal plants) that the indigenous populations had accumulated over generations. Individual intelligence without cultural inheritance is not enough.

The “cultural brain” hypothesis: the large human brain evolved not primarily for ecological problem-solving (the “ecological intelligence” hypothesis) or social manipulation (the “Machiavellian intelligence” hypothesis) but for cultural learning — the ability to acquire, store, and transmit the accumulated adaptive knowledge of the group. Brain size correlates with sociality and with the capacity for cultural transmission across primate species; Henrich argues that the causal arrow runs through culture.

The WEIRDest People in the World

The WEIRDest People in the World: How the West Became Psychologically Peculiar and Particularly Prosperous (2020) argues that the psychological profile treated as “universal human nature” by Western psychology is in fact the product of a specific cultural-evolutionary trajectory. WEIRD (Western, Educated, Industrialised, Rich, Democratic) populations are outliers on multiple psychological dimensions: individualism, analytical thinking, impersonal trust, guilt over shame, and universalistic moral reasoning. These traits are not the human default; they are the product of centuries of cultural evolution shaped by specific institutions — particularly the Western Church’s medieval marriage-and-family programme, which dissolved kin-based social structures and promoted individual autonomy, nuclear families, and voluntary associations.

The argument has implications for the social sciences: if WEIRD populations are psychologically unusual, then a psychology based primarily on WEIRD samples (as most experimental psychology is) is a psychology of one cultural variant, not of “human nature.” The cross-cultural experimental data Henrich and colleagues have collected over two decades is the empirical basis for this claim.

Where Henrich stops

The cumulative-culture argument is compelling at the species level but less developed at the mechanism level. How exactly does cultural learning accumulate? What are the cognitive mechanisms that make high-fidelity transmission possible? Henrich names imitation, teaching, and language as the channels, but the computational architecture of cultural learning — how the brain decides what to copy, how it integrates culturally acquired information with individual experience, how it detects and corrects errors in transmission — is not fully specified. The argument that humans evolved for cultural learning is a claim about what selection was for; the mechanism by which cultural learning works at the cognitive level is a separate question that the cultural-evolution framework identifies but does not answer.

The WEIRD thesis has been criticised on historiographic grounds. The claim that the Western Church’s marriage programme was the critical cause of Western psychological distinctiveness depends on a specific and contested historical narrative — that Church prohibitions on cousin marriage, polygyny, and extended-family households over a period of centuries dissolved the kin-based institutions that prevailed elsewhere. Jonathan Schulz and Henrich have provided quantitative evidence for the correlation between exposure to the Church’s marriage programme and contemporary psychological individualism, but whether the correlation is causal, and whether the Church programme is the critical variable rather than other features of Western European history (urbanisation, commerce, the state, the Reformation), is debated.

The cross-cultural experimental programme, while more extensive than any predecessor, covers a small fraction of the world’s cultural variation. Whether the fifteen societies studied are representative of the human range, and whether economic games played with real-money stakes capture the psychological dimensions that matter, are methodological questions that Henrich has addressed but that critics (Cecilia Heyes, Cristine Legare) have continued to press.

Key works

See also: Boyd · Richerson · Pinker · Darwinism