Human large-scale cooperation as a product of competition between cultural groups.

Abstract:

:A fundamental puzzle of human evolution is how we evolved to cooperate with genetically unrelated strangers in transient interactions. Group-level selection on culturally differentiated populations is one proposed explanation. We evaluate a central untested prediction of Cultural Group Selection theory, by assessing whether readiness to cooperate between individuals from different groups corresponds to the degree of cultural similarity between those groups. We documented the normative beliefs and cooperative dispositions of 759 individuals spanning nine clans nested within four pastoral ethnic groups of Kenya-the Turkana, Samburu, Rendille and Borana. We find that cooperation between groups is predicted by how culturally similar they are, suggesting that norms of cooperation in these societies have evolved under the influence of group-level selection on cultural variation. Such selection acting over human evolutionary history may explain why we cooperate readily with unrelated and unfamiliar individuals, and why humans' unprecedented cooperative flexibility is nevertheless culturally parochial.

journal_name

Nat Commun

journal_title

Nature communications

authors

Handley C,Mathew S

doi

10.1038/s41467-020-14416-8

subject

Has Abstract

pub_date

2020-02-04 00:00:00

pages

702

issue

1

issn

2041-1723

pii

10.1038/s41467-020-14416-8

journal_volume

11

pub_type

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