Measuring digit lengths with 3D digital stereophotogrammetry: A comparison across methods

Gremba, Allison P.; Weinberg, Seth M.

doi:10.1002/ajhb.23133

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…On the digital image, a line was digitally drawn from the middle of the lowest crease from the index and ring finger to the tip of each finger and the lengths of the lines were measured. The value obtained for second digit was then divided by the value of fourth digit separately for both hands to get 2d:4d (Allaway, Bloski, Pierson, & Lujan, ; Gremba & Weinberg, ). The digit lengths were measured twice independently and the consistency was examined using Cronbach's alpha test.…”

Section: Methodsmentioning

confidence: 99%

Association between second to fourth digit ratio and personality among Indian men

Bagepally

Majumder

Kotadiya

2019

American J Hum Biol

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Objectives To examine the relationship between the personality domains with the second to fourth digit ratio (2d:4d); a prenatal testosterone exposure marker. Methods The 2d:4d for both hands was measured for the Indian male subjects' (n = 994). Ten‐item personality inventory and displaced aggression questionnaire data were collected in a self‐reported proforma in this cross sectional study with a convenient sampling approach. Results The personality traits, namely openness to new experiences, carelessness, and self‐discipline were significantly differed between lower‐half and higher‐half of 2d:4d by median split. The right hand 2d:4d was positively correlated with open to new experiences and negatively correlated with disorganization, carelessness, and revenge planning. The left hand 2d:4d was positively correlated with aggression. On binary logistic regression, openness was positively associated while carelessness was negatively associated with the right hand 2d:4d and self‐discipline trait was negatively associated with the left hand 2d:4d. Conclusion This study affirmed the link between 2d:4d and domains of Big Five personality factors among Indian men and inverse relationship between 2d:4d and more “female” hands in the domains of disorganization, carelessness, and revenge planning even in men, emphasizing the effect of prenatal testosterone exposure on human personality.

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Section: Methodsmentioning

confidence: 99%

Association between second to fourth digit ratio and personality among Indian men

Bagepally

Majumder

Kotadiya

2019

American J Hum Biol

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“…It was not possible to capture data on the thumb because it was slightly rotated with the hand in the aforementioned posture. Similar landmarks collected from 2D digital scans used in a prior study of finger measurements showed very low error from repeated measures, with intraclass correlation coefficients exceeding 0.97 [ 5 ]. Using x , y coordinates from the collected landmarks, finger widths were calculated at the proximal and distal joints of fingers 2–5 on each hand ( Fig 1 ).…”

Section: Methodsmentioning

confidence: 88%

“…The present sample is focused on adults of recent (self-identified) European ancestry, recruited as either the unaffected relatives of index cases with an orofacial cleft or as unaffected controls. Starting with an initial sample of 754, individuals were excluded if they (1) were affected with a cleft of the lip and/or palate; (2) had missing data; (3) had any reported hand malformations (e.g., syndactyly) or conspicuous trauma or injuries; (4) reported having a genetic syndrome; (5) were over 60 years of age; or (6) reported an ancestry other than European. The upper age cut off was applied to mitigate the potential for age-related joint changes to impact the results [4].…”

Section: Methodsmentioning

confidence: 99%

Objective assessment of tapering of the fingers in adults

Weinberg

2022

PLoS ONE

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Mild proximal-to-distal tapering of the fingers is a relatively common trait in humans. When more extreme, finger tapering is a feature observed in many genetic syndromes. The range of variation for finger tapering in the general population is not well understood, and sex differences in the degree of tapering, while suspected, have not been documented. Part of the difficulty is a lack of objective methods to evaluate finger tapering. In the present report, we developed a tapering index based on linear measures derived from digital hand scans. We measured this index in a sample of 166 male and 166 age-matched female adults. We then looked at correlations both among fingers and with demographic and anthropometric variables, followed by tests for sex differences. We observed weak correlations between tapering and age, height and weight. Correlations between pairs of fingers tended to be more in the moderate range and were highest among the middle three fingers (ranging from 0.34 to 0.64). Tapering tended to increase slightly moving radially across the hand from the fifth finger to the second finger. Males showed less tapering than females for all fingers, with statistically significant differences involving the left second finger (p = 0.003), left fifth finger (p< 0.001), right second finger (p = 0.038), and right fourth finger (p = 0.021). Finally, we established baseline norms for both males and females out to three standard deviations. Our results indicate that finger tapering is present, to some degree, in most of the population and that the trait can be measured using a relatively simple and non-invasive method. These findings may have relevance for fields as diverse as medical genetics, forensics, and industrial design.

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“…The digital scans were imported into the program tpsDIG2 ( http://sbmorphometrics.org/index.html ) and landmarks were placed on the fifth finger at the midpoint of the metacarpophalangeal crease, the distal interphalangeal joint, and the distal margin of the fingertip ( Fig 1 ). A prior study of landmark-based finger dimensions obtained from digital scans have shown very low error from repeated measures, with intraclass correlation coefficients exceeding 0.97 [ 8 ]. Using x,y coordinates from the collected landmarks, the angle of the distal interphalangeal joint (between the middle and distal phalanges) was calculated to capture the degree of fifth finger radial curvature.…”

Section: Methodsmentioning

confidence: 99%

Bent pinkies: Quantifying fifth finger clinodactyly in a sample of U.S. adults

et al. 2022

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Mild curvature of the fifth finger (or clinodactyly) is a relatively common trait. While severe forms can cause functional impairment and are a feature of certain congenital syndromes, mild clinodactyly is considered a minor morphological variant. Despite exhibiting continuous variation, clinodactyly is rarely treated as a quantitative trait. Consequently, the degree of fifth finger curvature in the general population and the factors that impact this curvature are not well understood. In the present study, we measured fifth finger curvature in a sample of 1,295 U.S. adults and investigated the role of sex, age and body size. We found that clinodactyly exhibited a non-normal distribution. All participants displayed some degree of curvature, but it tended to be slight with an overall mean of 3.68 degrees (median: 3.58 degrees). In only 0.8% of cases did the curvature exceed the nominal 10-degree threshold for clinically meaningful clinodactyly. We did not find statically significant sex differences. Further, there was no meaningful relationship with height and only a weak positive relationship with age. We found that clinodactyly showed asymmetry; the curvature was greater on the left than on the right fifth finger (p < 2.2e-16), but this was not influenced by sex, age, or height. These results suggest the possibility that the kind of ubiquitous mild clinodactyly observed in the general population may be etiologically distinct from more rare and severe forms of the condition.

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Measuring digit lengths with 3D digital stereophotogrammetry: A comparison across methods

Cited by 5 publications

References 16 publications

Association between second to fourth digit ratio and personality among Indian men

Association between second to fourth digit ratio and personality among Indian men

Objective assessment of tapering of the fingers in adults

Bent pinkies: Quantifying fifth finger clinodactyly in a sample of U.S. adults

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