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Am J Hum Biol. 2015 Sep-Oct;27(5):620-7. doi: 10.1002/ajhb.22718. Epub 2015 Mar 30.

Digit ratio (2D:4D), aggression, and dominance in the Hadza and the Datoga of Tanzania.

Author information

1
Department of Cross-Cultural Psychology and Human Ethology, Institute of Ethnology and Anthropology, Russian Academy of Sciences, Moscow, Russia.
2
Department of General Ecology, Biological Faculty, Moscow State University, Moscow, Russia.
3
Institute of Psychology and Courant Research Center Evolution of Social Behavior, University of Göttingen, Göttingen, Germany.

Abstract

OBJECTIVES:

Digit ratio (2D:4D)-a putative marker of prenatal androgen activity-has been shown to correlate with self-reported physical aggression and dominance behavior, especially in male children and adolescents. This evidence is derived primarily from the study of Western samples.

METHODS:

Digit ratios, self-reported aggression, and dominance behavior were collected from men and women in two traditional, small-scale societies, i.e., the Hadza and the Datoga of Tanzania.

RESULTS:

We found significant differences in physical and verbal aggression, anger, and hostility between the two societies with the Datoga reporting higher scores on all four measures. Moreover, self-reported dominance in the Datoga was higher than in the Hadza. The Datoga showed lower left and right hand 2D:4D ratios than the Hadza. Men reported higher physical and verbal aggression and dominance, and had lower 2D:4D ratios than women. A significant negative association between 2D:4D and dominance was found in Hadza women.

CONCLUSIONS:

We discuss our findings with reference to differences in mating systems between the two small-scale societies and previous findings of Western and other small-scale societies.

PMID:
25824265
DOI:
10.1002/ajhb.22718
[Indexed for MEDLINE]

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