Relative Finger Lengths, Sex Differences, and Psychological Traits

@article{Loehlin2009RelativeFL,
  title={Relative Finger Lengths, Sex Differences, and Psychological Traits},
  author={John C. Loehlin and Sarah E. Medland and Nicholas G. Martin},
  journal={Archives of Sexual Behavior},
  year={2009},
  volume={38},
  pages={298-305}
}
Various finger length and personality and ability measures were obtained for a sample of Australian adolescent twins (306 boys and 397 girls). A new measure of relative finger length (the length of a given finger relative to the sum of all four fingers) was investigated, and shown to be superior to the traditional 2D:4D for discriminating between the sexes. It also had the advantage of permitting a more analytic approach: for example, the 2nd finger-length contributed much more than the 4th… 
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28 Citations
Highly Influential Citations
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Background Citations
12
Methods Citations
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Results Citations
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28 Citations

Ratio or Length? A Proposed Methodology for Understanding Digit Ratio and Personality Using a Female Sample
Mounting evidence suggests a link between digit ratio (2D:4D) and personality – albeit with generally small effect sizes. While the identified effects are usually attributed to in utero biochemistry,…
Sexual Dimorphism in Digit Ratios Derived from Dorsal Digit Length among Adults and Children
TLDR
The present findings from three samples are consistent with the idea that early sex-hormonal effects might be stronger for digit ratios involving digit 5, as compared to the classic, and frequently studied, ventrally measured 2D:4D ratio.
Multivariate Genetic Analyses of the 2D:4D Ratio: Examining the Effects of Hand and Measurement Technique in Data from 757 Twin Families
TLDR
Multivariate modeling of the left- and right-hand measurements revealed significant genetic and environmental covariation between hands, suggesting that X-linked effects (such as the previously identified association with the Androgen receptor) are likely to be small.
Effects of hand preference on digit lengths and digit ratios among children and adults.
The Second to Fourth Digit Ratio (2D:4D) in a Japanese Twin Sample: Heritability, Prenatal Hormone Transfer, and Association with Sexual Orientation
TLDR
The existence of non-shared environmental influences that affect both 2D:4D and sexual orientation are suggested, which are in the predicted direction according to the prenatal hormone transfer hypothesis.
Lengths, girths, and diameters of children's fingers from 3 to 10 years of age.
Testosterone and domain-specific risk: Digit ratios (2D:4D and rel2) as predictors of recreational, financial, and social risk-taking behaviors
Digit Ratio : An Indicator to the World Within
The ratio of index finger length to ring finger length known as digit ratio (2D:4D) is an indicator of prenatal androgen exposure. The 2D:4D ratio is sexually dimorphic, with average male 2D:4D…
Is CAG sequence length in the androgen receptor gene correlated with finger-length ratio?
Testosterone at your fingertips: Digit ratios (2D:4D and rel2) as predictors of courtship-related consumption intended to acquire and retain mates
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References

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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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