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Childhood first: Prolonged development before big brains in human evolution
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DOI：10.1016/j.dr.2026.101272.png)
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Abstract
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• Challenges the view that brain expansion drove prolonged human development. • Fossil evidence shows extended early development in small-brained hominins. • Refines cooperative breeding and cooperative care models of human evolution. • Cooperative childcare is the upstream condition enabling slow development and later encephalization. • Obstetrical, dental, and neurodevelopmental evidence converge on a social foundation for human cognition.
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