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Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins.
Horm Behav. 2006 Mar; 49(3):315-9.HB

Abstract

Finger-length ratio (second to fourth finger; 2D:4D) has been associated with various measures thought to be related to prenatal androgens. In addition, hormone-transfer theory posits that hormones can transfer between twins. We examined 2D:4D in same-sex (SS) and opposite-sex (OS) dizygotic twins to test both propositions. Results show that 2D:4D is masculinized in OS females compared to SS females. This provides strong evidence that 2D:4D is laid down prenatally, and that hormones (likely androgens) can transfer from male to female fetuses. Implications for developmental timeframes for both hormone-transfer and 2D:4D are discussed.

Authors+Show Affiliations

Department of Psychology, Simon Fraser University, Burnaby BC, Canada. saria@sfu.caNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Twin Study

Language

eng

PubMed ID

16143332

Citation

van Anders, Sari M., et al. "Finger-length Ratios Show Evidence of Prenatal Hormone-transfer Between Opposite-sex Twins." Hormones and Behavior, vol. 49, no. 3, 2006, pp. 315-9.
van Anders SM, Vernon PA, Wilbur CJ. Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins. Horm Behav. 2006;49(3):315-9.
van Anders, S. M., Vernon, P. A., & Wilbur, C. J. (2006). Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins. Hormones and Behavior, 49(3), 315-9.
van Anders SM, Vernon PA, Wilbur CJ. Finger-length Ratios Show Evidence of Prenatal Hormone-transfer Between Opposite-sex Twins. Horm Behav. 2006;49(3):315-9. PubMed PMID: 16143332.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins. AU - van Anders,Sari M, AU - Vernon,Philip A, AU - Wilbur,Christopher J, Y1 - 2005/09/06/ PY - 2005/06/07/received PY - 2005/08/08/revised PY - 2005/08/09/accepted PY - 2005/9/7/pubmed PY - 2006/5/5/medline PY - 2005/9/7/entrez SP - 315 EP - 9 JF - Hormones and behavior JO - Horm Behav VL - 49 IS - 3 N2 - Finger-length ratio (second to fourth finger; 2D:4D) has been associated with various measures thought to be related to prenatal androgens. In addition, hormone-transfer theory posits that hormones can transfer between twins. We examined 2D:4D in same-sex (SS) and opposite-sex (OS) dizygotic twins to test both propositions. Results show that 2D:4D is masculinized in OS females compared to SS females. This provides strong evidence that 2D:4D is laid down prenatally, and that hormones (likely androgens) can transfer from male to female fetuses. Implications for developmental timeframes for both hormone-transfer and 2D:4D are discussed. SN - 0018-506X UR - https://www.unboundmedicine.com/medline/citation/16143332/Finger_length_ratios_show_evidence_of_prenatal_hormone_transfer_between_opposite_sex_twins_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0018-506X(05)00199-6 DB - PRIME DP - Unbound Medicine ER -