The male warrior hypothesis: testosterone-related cooperation and aggression in the context of intergroup conflict
Author
dc.contributor.author
Muñoz Reyes, J. A.
Author
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Polo, P.
Author
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Valenzuela, N.
Author
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Pavez, P.
Author
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Ramírez Herrera, O.
Author
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Figueroa, O.
Author
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Rodríguez Sickert, C.
Author
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Díaz Solis, David
Author
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Pita, M.
Admission date
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2020-10-08T21:13:00Z
Available date
dc.date.available
2020-10-08T21:13:00Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Scientific Reports (2020) 10(1):375
es_ES
Identifier
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10.1038/s41598-019-57259-0
Identifier
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https://repositorio.uchile.cl/handle/2250/177063
Abstract
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The Male Warrior Hypothesis (MWH) establishes that men's psychology has been shaped by inter-group competition to acquire and protect reproductive resources. In this context, sex-specific selective pressures would have favored cooperation with the members of one's group in combination with hostility towards outsiders. We investigate the role of developmental testosterone, as measured indirectly through static markers of prenatal testosterone (2D:4D digit ratio) and pubertal testosterone (body musculature and facial masculinity), on both cooperation and aggressive behavior in the context of intergroup conflict among men. Supporting the MWH, our results show that the intergroup conflict scenario promotes cooperation within group members and aggression toward outgroup members. Regarding the hormonal underpinnings of this phenomenon, we find that body musculature is positively associated with aggression and cooperation, but only for cooperation when context (intergroup competition) is taken into account. Finally, we did not find evidence that the formidability of the group affected individual rates of aggression or cooperation, controlling for individual characteristics.
es_ES
Patrocinador
dc.description.sponsorship
Regular FONDECYT project from the government of Chile
1170513
FONDECYT Iniciacion project from the government of Chile
11181293