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The digit ratio is the ratio taken of the lengths of different digits or fingers on a hand. The most commonly studied digit ratio is that of the 2nd ( index finger ) and 4th ( ring finger ), also referred to as the 2D:4D ratio, measured on the palm side.
The index finger (also referred to as forefinger, [1] ... It is shorter than the middle finger, and may be shorter or longer than the ring finger (see digit ratio).
The first finger is an ambiguous term in the English language due to two competing finger numbering systems that can be used. It might refer to either the thumb or the index finger, depending on the context. Consequently, also the terms second finger, third finger and fourth finger depend on the
The ring finger, third finger, [1] fourth finger, [2] [3] leech finger, [4] or annulary is the fourth digit of the human hand, located between the middle finger and the little finger. [ 5 ] Sometimes the term ring finger only refers to the fourth digit of a left-hand , so named for its traditional association with wedding rings in many ...
Digit ratio (2D:4D, the ratio of index to ring finger length) is a widely used as a proxy measure for prenatal testosterone exposure. Hurd demonstrated that men with more feminine typical-digit ratios showed lower aggressive tendency than males with more masculine-typical digit ratios. [10]
The ratio of the length of the index finger to the length of the ring finger in adults is affected by the level of exposure to male sex hormones of the embryo in utero. This digit ratio is below 1 for both sexes but it is lower in males than in females on average.
On average, males have a larger waist in comparison to their hips (see waist–hip ratio) than females. [11] [12] In females, the index and ring fingers tend to be either more similar in size or their index finger is slightly longer than their ring finger, whereas male's ring finger tends to be longer. [13]
In the system used for example in Germany and France, the thumb represents 1, the thumb plus the index finger represents 2, and so on, until the thumb plus the index, middle, ring, and little fingers represents 5. This continues on to the other hand, where the entire one hand plus the thumb of the other hand means 6, and so on.