From the vault: Like science-backed palm reading, new studies use digit ratio to predict aggressive behavior and risk of disease.
Measure your index and ring fingers, base to tip. Divide the length of your index finger by the length of your ring finger to determine the digit ratio, or finger quotient . A longer ring finger results in an Fq of less than 1 and a more “masculine” hand shape. Researchers have discovered that a quick study of the hands — more specifically, the lengths of the index and ring fingers — can tell a lot about a person’s personality and risk of disease.
In boys, “during fetal development there’s a surge in testosterone in the middle of the second trimester” that seems to influence future health and behavior, says Pete Hurd, a neuroscientist at the University of Alberta. One easy-to-spot result of this flood of testosterone: a ring finger that’s significantly longer than the index finger.
Scientists are not at the point where they can factor in finger length to arrive at a diagnosis, but they’ve gathered evidence that shows how this prenatal hormone imbalance can affect a person for life, from increasing or decreasing your risk of certain diseases, to predicting how easily you get lost or lose your temper.
Researchers continue to study what sparks these hormonal changes and have begun looking at environmental chemical exposure, stress levels and diet during pregnancy.An index finger that’s shorter than the ring finger can be a sign of knee osteoarthritis risk, particularly in women, compared with people whose fingers are equal lengths, or who have a longer index finger.
Editor's Note: This article was amended on April 11 to reflect the following correction: Fq>1 is associated with an increased, not reduced, risk of oral cancer.
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