What is the second to fourth digit ratio?

The ratio of the lengths of the second to the fourth finger (the length of the index finger divided by the length of the ring finger and called the 2D:4D ratio), which is inherited, is a rough index of the amount of testosterone to which the fetus was exposed.

What is the 2D:4D effect?

That magic number is the ratio between the lengths of the second and fourth fingers, known as the 2D:4D ratio. It tends to be lower in men—meaning their fourth fingers tend to be longer than their second—than in women.

Is the 2D:4D ratio true?

Cohn and Zheng posit that what’s true for mice is true for humans as well: prenatal exposure to a mixture of testosterone and estrogen is what determines 2D:4D ratios. So the lower your 2D:4D digit ratio is, the more testosterone or less estrogen you were exposed to in the womb.

Which finger indicates testosterone?

Short index finger, more testosterone An index finger that is relatively short compared to the ring finger indicates that one has been exposed to a lot of testosterone in utero, whereas a relatively long index finger suggests a lower exposure to testosterone in the womb.

How do you find the digit ratio?

First, measure the length of your index finger from crease to tip. Then do the same for your ring finger. Divide the first number by the second to calculate your 2:4 digit ratio. For example, my index finger is 7.8cm and my ring finger is 8.2cm, so my ratio is 7.8÷8.2=0.95, which is precisely the average for a man.

What is the 2D:4D ratio in humans?

The second digit is typically shorter in both males and females, while the difference in length of the two digits is greater in males than females. The normal range of 2D: 4D ratios among males and females have been reported to be 0.947±0.029 and 0.965±0.026, respectively [13].

What is the 2D 4D ratio in humans?

How do you calculate 2D to 4D ratio?

The 2D:4D ratio is the most 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. A number of studies have shown a correlation between the 2D:4D digit ratio and various physical and behavioral traits.

Does finger length indicate testosterone levels?

Finger length ratio (2D:4D) is a sexually dimorphic trait. Men have relatively shorter second digits (index fingers) than fourth digits (ring fingers). Smaller, more masculine, digit ratios are thought to be associated with either higher prenatal testosterone levels or greater sensitivity to androgens, or both.

What does my digit ratio mean?

The digit ratio is the ratio of the lengths of different digits or fingers. The 2D:4D ratio is the most 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.