The effects of hand preference and sex on right-left asymmetry in dorsal digit lengths among adults and children.

  title={The effects of hand preference and sex on right-left asymmetry in dorsal digit lengths among adults and children.},
  author={Sanjay Kumar and Martin Voracek and Maharaj Singh},
  journal={Early human development},
Stature estimation for Saudi men based on different combinations of upper limb part dimensions
Abstract Estimating stature based on body/limb parts can help define the characteristics of unidentified bodies. The most studied upper limb part is the hand, although few studies have examined
Hand preference and Mathematical Learning Difficulties: New data from Greece, the United Kingdom, and Germany and two meta-analyses of the literature
It is suggested that potential handedness effects require larger samples, direction of hand preference is not a sensitive enough measure of handedness in this context, or that increased rates of atypical hand preference are not associated with MLD.


Evaluation of hand asymmetry in relation to hand preference.
Right-left differences in the hand-shape index and palmar length/width values of the strong left- handers, weak left-handers, and ambidextrous individuals were found to be statistically significant according to sex; in contrast, the strong and weak right-hander showed no significant differences according tosex.
Bilateral asymmetry in left handers increased concerning morphological laterality in a recent sample of young adults.
  • M. Sander, C. Scheffler
  • Psychology, Medicine
    Anthropologischer Anzeiger; Bericht uber die biologisch-anthropologische Literatur
  • 2016
The results of the present anthropometric study indicate a slight change to more morphological laterality in left handers in the past 30 years.
Bilateral asymmetry in bone measurements of the hand and lateral hand dominance.
The results suggest an inherent tendency of the right second metacarpal to have more bone than the left regardless of hand dominance, which will increase the bilateral difference in the right handed and reduce it in the left handed.
Cross‐sectional data on soft tissue morphometry of the growing hand and fingers of dextral individuals 5–65 years old
A novel finding was that certain relationships (inflection points, correlation coefficients and gender differences in digit lengths) seemed to follow gradients running from 2D to 5D, tempting to speculate that these are manifestations of the antero‐posterior gradients established by signalling events that control digit development and patterning in utero.
Sex Differences in Directional Asymmetry of Digit Length and its Effects on Sex Differences in Digit Ratio (2D:4D)
Based on six samples totaling about 3,000 individuals, the present study replicated the first finding of Martin, Puts, and Breedlove (2008), which found leftward bias was more frequent among men and rightward bias more frequently among women, and replicated the second finding, which was smaller by orders of magnitude and not significant.
Sexual Dimorphism in Digit Ratios Derived from Dorsal Digit Length among Adults and Children
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.
Finger Length Ratio (2D:4D) in Left- and Right-Handed Males
The result can be interpreted as proof that left-handers were subjected to higher levels of testosterone in utero, and the value of Dr–l in left- handers was significantly lower than Dr-l in right-hander.
Hand Asymmetry in Heterosexual and Homosexual Men and Women: Relationship to 2D:4D Digit Ratios and Other Sexually Dimorphic Anatomical Traits
The present evidence actually suggests that homosexuals have lower FA than heterosexuals, raising the question of whether the positive fitness components associated with low FA may contribute to selection that maintains homosexuality in a population.
Differential Placing of Flexion Creases Contributes to Sex Differences in the Second-to-Fourth Digit Ratio (2D:4D)
The present study supports the likelihood that differential placing of flexion creases in the digits contributes to the occurrence of sex differences in palmar 2D:4D, and shows that men have lower palmar-to-dorsal digit ratios than women.