The eyes may be the window to the soul, but the hands can tell you a lot about a person too. Whether they are calloused for instance, or cotton soft. The fingers in particular can give you further insights. A collaborative study conducted by Oxford and Northumbria researchers in the UK, found that differences in the lengths of certain fingers indicated whether a person tended to be more promiscuous or monogamous by nature. The secret lies with the ring finger in comparison to the index.
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Biologists at the University of Florida have found a reason why men's ring fingers are generally longer than their index fingers -- and why the reverse usually holds true for women. The finding could help medical professionals understand the origin of behavior and disease, which may be useful for customizing treatments or assessing risks in context with specific medical conditions. Differences in how these hormones activate receptors in males and females affect the growth of specific digits. The discovery provides a genetic explanation for a raft of studies that link finger proportions with traits ranging from sperm counts, aggression, musical ability, sexual orientation and sports prowess, to health problems such as autism, depression, heart attack and breast cancer. It has long been suspected that the digit ratio is influenced by sex hormones, but until now direct experimental evidence was lacking. There is growing evidence that a number of adult diseases have fetal origins. With the new data, we've shown that that the digit ratio reflects one's prenatal androgen and estrogen activity, and that could have some explanatory power.
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The ratio between the second and fourth fingers, known as 2D:4D , is considered a sexually dimorphic trait. Men, on average, have shorter index fingers than ring fingers, while women typically have index and ring fingers of similar lengths. Watts and her colleagues recruited identical twin pairs with different sexualities, 18 sets of female twins and 14 male pairs. In consideration to previous research, the team hypothesized that different exposure or reaction to prenatal androgens male sex hormones like testosterone could contribute to why one twin was straight and the other was not — and that would be reflected in their finger ratios.
All rights reserved. Is your ring finger longer or shorter than your index finger? The reason for the difference is in our hormones, a new study in mice shows for the first time. Before birth, the sex hormones estrogen and testosterone control genes that in turn dictate finger length, the study found.