Individual intelligence alone cannot sustain human survival without cumulative cultural knowledge
Evidence
The contrast with our lost European explorers could hardly be starker. One lone woman equipped with only the cumulative know-how of her ancestors survived for eighteen years whereas fully provisioned and well-financed teams of experienced explorers struggled in Australia, Texas, and the Arctic. These diverse cases testify to the nature of our species’ adaptation. During eons of relying on large bodies of cumulative cultural knowledge, our species became addicted to this cultural input; without culturally transmitted knowledge about how to locate and process plants, fashion tools from available materials, and avoid dangers, we don’t last long as hunter-gatherers. Despite the intelligence we acquire from having such big brains, we can’t survive in the kinds of environments so commonly inhabited by our hunter-gatherer ancestors over our evolutionary history. While our attention, cooperative tendencies, and cognitive abilities have likely been shaped by natural selection to life in our ancestral environments, these genetically evolved psychological adaptations are entirely insufficient for our species. Neither our intelligence nor domain-specific psychological abilities fire up to distinguish edible from toxic plants or to construct watercraft, bone awls, snow houses, canoes, fishhooks, or wooden sledges. Despite the critical importance of hunting, clothing, and fire in our species’ evolutionary history, no innate mental machinery delivered to our explorers information on locating snow-covered seal holes, making projectiles, or starting fires. … Our species’ uniqueness, and thus our ecological dominance, arises from the manner in which cultural evolution, often operating over centuries or millennia, can assemble cultural adaptations. In the cases above, I’ve emphasized those cultural adaptations that involve tools and know-how about finding and processing food, locating water, cooking, and traveling. But as we go along, it will become clear that cultural adaptations also involve how we think and what we like, as well as what we can make. — Joseph Henrich, The Secret of Our Success, 135
Categorization
- XREF: This is the signature Henrich thesis — cultural brain hypothesis — carried across the whole book; connects to the opening discussion in earlier framing. — connects to: Once cultural knowledge accumulates, individuals cannot invent better traits than they can copy — Joseph Henrich, The Secret of Our Success: How Culture…, 205; Human survival competence depends on inherited knowledge, not innate wit alone — Joseph Henrich, The Secret of Our Success: How Culture…, 41; Humans dominate diverse habitats despite physical weakness and sparse innate knowledge — Joseph Henrich, The Secret of Our Success: How Culture…, 37 (+10 more)
Broader Connections
- Selective social learning yields group-level cultural accumulation beyond any individual’s knowledge
#corroborates(0.95) — Joseph Henrich, The Secret of Our Success, 198 - Human cumulative culture emerges from evolved domain-specific cognitive adaptations for social learning
#expands(0.90) — Joe Henrich and Robert Boyd, The Evolution of Conformist…, 16 - Collective intelligence exceeds any individual’s without erasing individual expertise
#corroborates(0.88) — Yves Citton, The Ecology of Attention, 552 - Long postreproductive human lifespans evolved to transmit accumulated cultural knowledge.
#expands(0.85) — Joseph Henrich, The Secret of Our Success, 446