Digit ratio

Digit Ratio

Digit ratio is a term used in anthropology, biology, and psychology to denote the relative lengths of the index finger and the ring finger of the human hand. It is often symbolized as 2D:4D, where 2D stands for the second digit (the index finger) and 4D stands for the fourth digit (the ring finger).

Pronunciation

• Digit: /ˈdɪdʒɪt/
• Ratio: /ˈreɪʃioʊ/

Etymology

The term "digit" comes from the Latin word "digitus", which means "finger". The term "ratio" comes from the Latin word "ratio", which means "reason" or "calculation".

Explanation

The digit ratio is calculated by dividing the length of the index finger by the length of the ring finger. This ratio is believed to be influenced by prenatal androgen exposure, with a lower 2D:4D ratio associated with higher androgen exposure.

Related Terms

• Androgen
• Index Finger
• Ring Finger
• Anthropology
• Biology
• Psychology

Studies and Findings

Numerous studies have found correlations between the digit ratio and various physical and behavioral traits. For example, a lower digit ratio (indicating higher prenatal androgen exposure) has been associated with increased risk of prostate cancer, better performance in sports, and increased likelihood of exhibiting aggressive behavior.

See Also

• Finger Length
• Handedness
• Human Physical Appearance

External links

• Medical encyclopedia article on Digit ratio
• Wikipedia's article - Digit ratio

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