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Typical female 2nd-4th finger length (2D:4D) ratios in male-to-female transsexuals-possible implications for prenatal androgen exposure.
Psychoneuroendocrinology. 2006 Feb; 31(2):265-9.P

Abstract

Prenatal exposure to androgens has been implicated in transsexualism but the etiology of the condition remains unclear. The ratio of the 2nd to the 4th (2D:4D) digit lengths has been suggested to be negatively correlated to prenatal androgen exposure. We wanted to assess differences in 2D:4D ratio between transsexuals and controls. Sixty-three male-to-female transsexuals (MFT), 43 female-to-male transsexuals (FMT), and 65 female and 58 male controls were included in the study. Photo copies of the palms and digits of the hands were taken of all subjects and 2D:4D ratios were measured, according to standard published procedures. Comparison between right-handed individuals revealed that the right-hand 2D:4D in MFT is higher than in control males but similar to that observed in control females. In FMT we found no differences in 2D:4D relative to control females. Our findings support a biological etiology of male-to-female transsexualism, implicating decreased prenatal androgen exposure in MFT. We have found no indication of a role of prenatal hormone exposure in female-to-male transsexualism.

Authors+Show Affiliations

Clinical Neuroendocrinology Group, Max Planck Institute of Psychiatry, Kraepelinstrasse 10, 80804 Munich, Germany. schneider@mpipskyl.mpg.deNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

16140461

Citation

Schneider, Harald J., et al. "Typical Female 2nd-4th Finger Length (2D:4D) Ratios in Male-to-female Transsexuals-possible Implications for Prenatal Androgen Exposure." Psychoneuroendocrinology, vol. 31, no. 2, 2006, pp. 265-9.
Schneider HJ, Pickel J, Stalla GK. Typical female 2nd-4th finger length (2D:4D) ratios in male-to-female transsexuals-possible implications for prenatal androgen exposure. Psychoneuroendocrinology. 2006;31(2):265-9.
Schneider, H. J., Pickel, J., & Stalla, G. K. (2006). Typical female 2nd-4th finger length (2D:4D) ratios in male-to-female transsexuals-possible implications for prenatal androgen exposure. Psychoneuroendocrinology, 31(2), 265-9.
Schneider HJ, Pickel J, Stalla GK. Typical Female 2nd-4th Finger Length (2D:4D) Ratios in Male-to-female Transsexuals-possible Implications for Prenatal Androgen Exposure. Psychoneuroendocrinology. 2006;31(2):265-9. PubMed PMID: 16140461.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Typical female 2nd-4th finger length (2D:4D) ratios in male-to-female transsexuals-possible implications for prenatal androgen exposure. AU - Schneider,Harald J, AU - Pickel,Johanna, AU - Stalla,Günter K, Y1 - 2005/09/02/ PY - 2005/04/26/received PY - 2005/07/25/revised PY - 2005/07/26/accepted PY - 2005/9/6/pubmed PY - 2006/3/11/medline PY - 2005/9/6/entrez SP - 265 EP - 9 JF - Psychoneuroendocrinology JO - Psychoneuroendocrinology VL - 31 IS - 2 N2 - Prenatal exposure to androgens has been implicated in transsexualism but the etiology of the condition remains unclear. The ratio of the 2nd to the 4th (2D:4D) digit lengths has been suggested to be negatively correlated to prenatal androgen exposure. We wanted to assess differences in 2D:4D ratio between transsexuals and controls. Sixty-three male-to-female transsexuals (MFT), 43 female-to-male transsexuals (FMT), and 65 female and 58 male controls were included in the study. Photo copies of the palms and digits of the hands were taken of all subjects and 2D:4D ratios were measured, according to standard published procedures. Comparison between right-handed individuals revealed that the right-hand 2D:4D in MFT is higher than in control males but similar to that observed in control females. In FMT we found no differences in 2D:4D relative to control females. Our findings support a biological etiology of male-to-female transsexualism, implicating decreased prenatal androgen exposure in MFT. We have found no indication of a role of prenatal hormone exposure in female-to-male transsexualism. SN - 0306-4530 UR - https://www.unboundmedicine.com/medline/citation/16140461/Typical_female_2nd_4th_finger_length__2D:4D__ratios_in_male_to_female_transsexuals_possible_implications_for_prenatal_androgen_exposure_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0306-4530(05)00177-0 DB - PRIME DP - Unbound Medicine ER -