For the observation about the frequencies of leading digits of numbers, see Benford's law.
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Hand with index finger being shorter than the ring finger, resulting in a small 2D:4D ratio, pointing to a high exposure to testosterone in the uterus.Image shows the measurement procedure of dorsal digit length using vernier calipers. The hand is placed on the edge of a table so that fingers are rested on table while making an angle of 90 degrees to the palm.
The digit ratio is the ratio taken of the lengths of different digits or fingers on a hand. In modern sciences, the 2D:4D ratio has become the most commonly studied digit ratio and is calculated by dividing the length of the index finger of a given hand by the length of the ring finger of the same hand. Some studies claimed that males have a lower 2D:4D ratio than females, on average; however, there are studies showed contradictory findings.[1]
Although studies have claimed to show a correlation between the 2D:4D digit ratio and various physical and behavioral traits,[2] these studies have drawn criticism for irreproducible or contradictory findings,[3][4][5] exaggerated claims of usefulness,[6][7] and lack of high quality research protocols.[7]
^Nayak, Satheesha B.; Nair, Dhiviah; Ravi, Vimal; Aithal, Ashwini P. (20 September 2018). "A comparative study on digit ratio and hand patterns of three ethnic races of Malaysia". Egyptian Journal of Forensic Sciences. 8 (1): 56. doi:10.1186/s41935-018-0087-1. ISSN 2090-5939.
^Dolan, Eric W. (12 January 2024). "Surprising connection found between finger length ratios and psychopathological traits". PsyPost. Archived from the original on 12 January 2024. Retrieved 12 January 2024.
^Kowal M, Sorokowski P, Żelaźniewicz A, Nowak J, Orzechowski S, Żurek G, et al. (June 2020). "No relationship between the digit ratios (2D:4D) and salivary testosterone change: Study on men under an acute exercise". Scientific Reports. 10 (1): 10068. Bibcode:2020NatSR..1010068K. doi:10.1038/s41598-020-66915-9. PMC 7308391. PMID 32572079.
^Cite error: The named reference Leslie_2019 was invoked but never defined (see the help page).
^Cite error: The named reference Jones_2020 was invoked but never defined (see the help page).
^Cite error: The named reference Joannides_2011 was invoked but never defined (see the help page).
^ abCite error: The named reference Smoliga_2021 was invoked but never defined (see the help page).
The digitratio is the ratio taken of the lengths of different digits or fingers on a hand. In modern sciences, the 2D:4D ratio has become the most commonly...
middle finger, and may be shorter or longer than the ring finger (see digitratio). "Index finger" literally means "pointing finger", from the same Latin...
flaccid length and height. One study investigated the relationship with digitratio and found that men with longer ring fingers than index fingers had slightly...
2D:4D digitratio) had only a small effect size of 0.036 on aggressive or violent behavior. The authors further concluded that "the 2D:4D digitratio is...
A finger is a prominent digit on the forelimbs of most tetrapod vertebrate animals, especially those with prehensile extremities (i.e. hands) such as...
the womb as a fetus. Higher pre-natal testosterone indicated by a low digitratio as well as adult testosterone levels increased risk of fouls or aggression...
fourth digit of the human hand, located between the middle finger and the little finger. Sometimes the term ring finger only refers to the fourth digit of...
record-setting calculations of the digits of π often result in news headlines. The symbol used by mathematicians to represent the ratio of a circle's circumference...
level of exposure to male sex hormones of the embryo in utero. This digitratio is below 1 for both sexes but it is lower in males than in females on...
fetish interest had a greater number of older brothers, a high 2D:4D digitratio (which would indicate excessive prenatal estrogen exposure), and an elevated...
In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Expressed...
testosterone exposure. In addition, daily achievements of traders with lower digitratio are more sensitive to circulating testosterone. A long-term study of...
original on 4 April 2023. Retrieved 27 July 2022. Manning, John T. (2002). DigitRatio: A Pointer to Fertility, Behavior, and Health. Rutgers University Press...
(including pedophilia) had a greater number of older brothers, a high 2D:4D digitratio (which would indicate low prenatal androgen exposure), and an elevated...
using only the digits 0 and 1, and avoiding the digit sequence "11" – this is called a standard form. A base-φ numeral that includes the digit sequence "11"...
targets Guidonian hand – Medieval mnemonic device for choral singers Digitratio – Ratio of lengths of fingers Eigenface – Set of eigenvectors used in the...
increased impulsivity. A 2010 British study found that a large 2D:4D digitratio, an indication of high prenatal estrogen exposure, was a "positive correlate...
important for Web-to-print applications. A hex triplet is a six-digit (or eight-digit), three-byte (or four-byte) hexadecimal number used in HTML, CSS...
Marcelo; Mendenhall, Zack (2011). "Testosterone and domain-specific risk: Digitratios (2D:4D and rel2) as predictors of recreational, financial, and social...
representation of binary-coded values. Each hexadecimal digit represents four bits (binary digits), also known as a nibble (or nybble). For example, an...
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