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The 2D:4D ratio is calculated by dividing the length of the index finger by the length of the ring finger of the same hand. Other digit ratios are also calculated similarly in the same hand. The digit length is typically measured on the palmar (ventral, "palm-side") hand, from the midpoint of the bottom crease to the tip of the finger. [8]
The difference in finger length is caused by the amount of testosterone and estrogen one receives in the womb. More testosterone means a shorter index finger compared to the ring finger, and more ...
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]
Researchers at McGill University in Canada examined the hands of 155 adult men and women, measuring the length of their ring fingers and pointer fingers. Man's finger length reveals how he treats ...
The 2D;4D finger ratio, or relative lengths of the 2nd "index" and 4th "ring" fingers, has become a popular measure of prenatal androgen because of accumulated evidence suggesting the 2D;4D ratios are related to prenatal exposure to testosterone. [56]
What is the Normal Testosterone Level for a 70-Year-Old Man? 156–819 ng/dL. The researchers also broke the data down into normal levels of free testosterone and bioavailable testosterone.
Research has linked the ratio of lengths between the index and ring fingers to higher levels of testosterone, and to various physical and behavioral traits such as penis length [31] and risk for development of alcohol dependence [32] or video game addiction. [33]
The type of hands that are physically attractive are those with longer index and ring fingers. [111] Men have a smaller index-to-ring-finger ratio than women. The gender differences in the ratio between the index and ring fingers are said to be influenced by exposure to testosterone within the womb. [112]