Effects of hand preference on digit lengths and digit ratios among children and adults.

@article{Kumar2020EffectsOH,
  title={Effects of hand preference on digit lengths and digit ratios among children and adults.},
  author={Sanjay Kumar and Maharaj Singh and Martin Voracek},
  journal={Early human development},
  year={2020},
  volume={151},
  pages={
          105204
        }
}

Figures and Tables from this paper

Digit ratio in the common toad Bufo bufo: the effects of reduced fingers and of age dependency

TLDR
It is argued that the correct finger numbering scheme should be based on the assumption that the first finger, not the fifth finger, was reduced on the forelimbs in Anura, and the age of individuals should be included in future digit ratio studies.

Digit ratio (2D:4D) and handedness: A meta-analysis of the available literature

TLDR
A meta-analysis of correlations between handedness and digit ratio (2D:4D), a putative marker of prenatal testosterone, results do not confirm any theory linking prenatal androgens with handedness, so it is speculated they instead reflect the mechanical action of writing causing subtle changes in the musculature and/or fat pads of the fingers.

References

SHOWING 1-10 OF 102 REFERENCES

Association of Height and Weight with Second to Fourth Digit Ratio (2D:4D) and Sex Differences

TLDR
The results suggest that height of adults reflecting prenatal hormone status may play a role in differences between men and women in 2D:4D digit ratio for right-handers.

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.

Comparison of all hand digit length ratios in left- and right-handed individuals

TLDR
The results of this study suggest that left-handed women could be especially successful in sports that require grasping a ball, and this criterion should be considered for left- handed women while selecting athletes.

Sex dimorphism in digital formulae of children.

TLDR
Test for a sex difference in the relative lengths of the finger bones, including the second-to-fourth digit ratio (2D:4D), using left-hand radiographs taken in young children indicate that relative digit lengths are sex-dimorphic in children, and suggests that 3D: 4D may be a better marker of perinatal sex differentiation.

Comparative Study of Digit Ratios (2D:4D and Other) and Novel Measures of Relative Finger Length: Testing Magnitude and Consistency of Sex Differences across Samples

  • M. Voracek
  • Psychology, Biology
    Perceptual and motor skills
  • 2009
TLDR
This study investigated the magnitude and cross-sample consistency of sex differences in all six possible digit ratios and in four novel relative finger-length measures suggested by Loehlin, Medland, and Martin as possibly superior to digit ratios for discriminating between the sexes.

Human 2D (index) and 4D (ring) finger lengths and ratios: cross‐sectional data on linear growth patterns, sexual dimorphism and lateral asymmetry from 4 to 60 years of age

TLDR
It is concluded that age, lateral asymmetry and hand preference are potential confounding factors and that future study designs should take account of these as well as other known confounders such as ethnicity, birth order, menstrual cycle phase and sexual preference.

The 2nd:4th digit ratio and asymmetry of hand performance in Jamaican children

TLDR
Testosterone, particularly prenatal testosterone, has been implicated in the aetiology of many extragenital sexually dimorphic traits and it is suggested that the 2D:4D ratio may be associated with the expression of other sexuallyDimorphic behavioural traits.

Relative Finger Lengths, Sex Differences, and Psychological Traits

TLDR
A new measure of relative finger length was investigated and shown to be superior to the traditional 2D:4D for discriminating between the sexes, and had the advantage of permitting a more analytic approach.

Effects of prenatal alcohol exposure on forepaw digit length and digit ratios in rats.

TLDR
Rat digit ratios differ between the sexes, and prenatal alcohol exposure affects digit ratios, and the results are consistent with a perinatal disruption of testosterone levels by alcohol and/or of testosterone's effects on digit length and ratios.
...