Joe Henrich and Robert Boyd — The Evolution of Conformist Transmission and the Emergence of Between-Group Differences

49 published claims from this book.

• Adaptive problems reduce to reading imperfect environmental cues of two kinds.
• Aggregated past innovations trap groups on locally optimal yet suboptimal trajectories
• Conformism stays adaptive under rapid change though heavy social learning does not
• Conformist bias evolution requires less environmental stability than social learning evolution itself.
• Conformist transmission amplifies majority traits toward fixation across generations.
• Conformist transmission biases learners toward adopting a population’s most frequent cultural traits.
• Conformist transmission evolves robustly across far more conditions than heavy social learning does
• Conformist transmission increases behavioral adoption odds above population frequency.
• Conformist transmission is favored across a broader range of conditions than mere social learning.
• Conformist transmission is favored only when some migration exists.
• Conformist transmission may be the evolutionary foundation for third-party punishment.
• Conformist transmission means copying the commonest behavior more than its frequency warrants
• Conformist transmission skews trait frequency toward the population majority beyond unbiased copying.
• Conformist transmission stays strong even when environmental cues are highly accurate or uninformative.
• Conformist transmission strength is a tunable model parameter.
• Cultural accumulation locks groups into local optima because traits are integrated
• Cultural adaptation is path-dependent and condemned to local optima
• Cultural variation between groups requires an adaptive explanation consistent with evolved psychology.
• Cultural variation can persist without social learning through locally complementary solution sets.
• Ecology cannot explain divergent cultural traits among neighboring Amazonian groups
• Environment alone cannot explain cultural differences between groups
• Equilibrium was reached within 300,000 simulated generations in every run
• Evolutionary outcomes for learning strategies do not depend on starting genotype frequencies.
• Evolutionary selection robustly favors copying the majority even when environments shift often.
• Explaining intergroup cultural variation requires analysis at two coupled levels
• Human cumulative culture emerges from evolved domain-specific cognitive adaptations for social learning
• Identical environments can require a century to erase distinct cultures.
• Individual learning from environmental cues does not always yield the adaptive behavior.
• Local-optima logic fails where a stepwise-improvement pathway exists between variants
• Migration among subpopulations weakens reliance on social learning but barely affects conformist transmission strength.
• Multiple local optima alone cannot explain persistent rejection of superior practices
• Natural selection favors conformist transmission under a wide range of conditions, including fluctuating environments.
• Natural selection shaped psychological mechanisms that determine which cultural beliefs persist.
• No flexible-learning scenario eliminates the adaptive need for conformity.
• Nonconformity is costly because deviant behaviors fail to complement the culture.
• Observational learning enables cumulative cultural evolution of behaviors no individual could invent alone
• Optimization models predict steady states but carry no historical dimension
• Path-dependent boat designs locked Chinese and European shipwrights onto separate trajectories
• Selection favors conformist transmission in both spatially and temporally varying environments
• Selection favors learning mechanisms acquiring the locally favored behavior.
• Shared beliefs can sustain group boundaries despite environmental and technological similarity.
• Similar environments and technologies produce divergent cultural systems.
• Similar technologies in similar environments do not force similar cultural systems.
• Simulated selection reaches near-equilibrium within 300,000 generations.
• Social information is only a reliable cue if current behavior already outperforms random.
• Societies sharing identical technology and environment can diverge sharply in social organization.
• Some high-frequency behavioral norms persist without punishment-based enforcement.
• Third-party punishment can stabilize any cultural trait within a group
• Unbiased transmission cannot maintain cultural boundaries under any mixing