Culture, Not Genes, Drove Human Global Dominance, Study Finds

New research by Arizona State University evolutionary anthropologist Charles Perreault indicates that human global dominance was primarily achieved through cultural evolution, rather than solely biological evolution.

Perreault's study quantifies the significance of culture in human expansion, noting that humans did not require genetic mutations to adapt to various environments such as the Arctic, tropical forests, deserts, or high altitudes. Instead, adaptation occurred via culturally transmitted technologies, ecological knowledge, and cooperative social norms. Innovations in areas like clothing, shelter, hunting strategies, food processing, and social organization spread rapidly through social learning.

Humans did not require genetic mutations to adapt to various environments... Instead, adaptation occurred via culturally transmitted technologies, ecological knowledge, and cooperative social norms.

Quantifying Culture's Rapid Impact

According to the research, humans occupy approximately 51 million square miles of land, significantly more than the typical wild mammal species' range of about 64 square miles. Perreault's analysis suggests that if humans had relied only on genetic evolution, achieving their current geographic range would have taken tens of millions of years, involved thousands of separate species, and required vast differences in body size.

The research estimates that cultural evolution condensed the equivalent of roughly 88 million years of biological diversification into approximately 300,000 years within a single species. This reframes recent human history as an adaptive radiation driven by cultural diversification rather than speciation, highlighting how a cultural inheritance system accelerates a lineage's expansion.

Cultural evolution condensed the equivalent of roughly 88 million years of biological diversification into approximately 300,000 years within a single species.

Research Methodology

To conduct this research, Perreault compiled geographic range maps for nearly 6,000 terrestrial mammal species, grouping them into genera, families, and orders. He then compared the size and ecological diversity of these ranges to the global human range. A model was developed to relate range size to indicators of evolutionary change, such as lineage age, number of species, and body-mass variation. The study also compared mammal species' ranges to cultural group territories to assess if cultural evolution allows for finer spatial specialization.

Towards a Quantitative Science of Human Macroevolution

Perreault described this study as part of an ongoing effort to establish a quantitative science of human macroevolution, using comparative datasets and evolutionary theory to measure culture's role in shaping human trajectory.