Digit ratio (2D:4D) and its behavioral correlates in infant rhesus macaques (Macaca mulatta)

Paukner, A. ORCID: 0000-0002-3421-1864, 2020. Digit ratio (2D:4D) and its behavioral correlates in infant rhesus macaques (Macaca mulatta). Developmental Psychobiology, 62 (7), pp. 992-998. ISSN 0012-1630

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2D:4D ratios are typically lower in adult human males than females and are linked to numerous sex-differentiated behaviors. 2D:4D digit ratios are considered an indicator of prenatal androgen exposure; if so, children’s 2D:4D ratios would arguably be even better indicators of prenatal androgen exposures since children have experienced fewer postnatal influences than adults. However, sex differences in 2D:4D ratios as well as associations between 2D:4D ratios and sex-typed behaviors in children have been inconsistent. Several studies also report sex differences and behavioral correlates of 2D:4D ratios in adult non-human primates, but little is known about 2D:4D ratios in infant non-human primates. The current study examined sex differences in 2D:4D ratios over the first month of life, and associations with behavioral outcomes at 12-24 weeks of age, in N=304 infant rhesus macaques. An increase in 2D:4D ratios over the first month of life was found, as well as associations with aggression and play behaviors, but no sex differences in 2D:4D ratios were observed. These results highlight the need for future developmental studies of 2D:4D ratios in order to determine not only their stability and predictive value, but also to discern the mechanism connecting prenatal androgen exposure, 2D:4D ratios, and behavioral outcomes.

Item Type: Journal article
Publication Title: Developmental Psychobiology
Creators: Paukner, A.
Publisher: John Wiley
Date: November 2020
Volume: 62
Number: 7
ISSN: 0012-1630
Rights: © 2019 the authors. Developmental Psychobiology published by Wiley Periodicals, Inc. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Divisions: Schools > School of Social Sciences
Record created by: Jonathan Gallacher
Date Added: 20 Aug 2019 12:34
Last Modified: 29 Oct 2020 15:59
URI: https://irep.ntu.ac.uk/id/eprint/37377

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