What is "2D:4D"?
A) the ratio of one's index finger length (second digit) to their ring finger length (fourth digit)
B) the ratio at which dopamine receptors fire in the second cerebral lobe to the fourth cerebral lobe
C) the ratio of sexual dimorphism in twins (2) to that of quadruplets (4)
D) the rate of androgen release in the second trimester of pregnancy (2) to the first trimester of life after birth (4)

Question

Quizplus · Accepted Answer

2D:4D refers to the ratio of the length of the second digit (index finger) to the fourth digit (ring finger). It has been suggested that this ratio may be related to prenatal exposure to testosterone and may be linked to various traits and behaviors, such as aggression and risk-taking.

What Is "2D:4D