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Many of us have studied our hands and noticed whether our index or ring finger is longer. For most, this is a purely aesthetic concern, or the vague memory of something we heard somewhere about what this difference means. It turns out, whether you have a longer index or ring finger means a lot. There are differences between and within sexes in finger lengths associated with relatively more masculine versus feminine development.
In fact, prenatal hormone exposure may provide important insights into the sources of sex differences in a variety of health conditions in adults. Of course, we cannot measure prenatal hormone exposure in people. Nearly 20 years ago, Berkeley psychologist Marc Breedlove now at Michigan State published a study in Nature where he and his colleagues measured finger-length ratios in adults in San Francisco. Based on this data, they concluded that finger-length ratios show. They are not only claiming that the 2D:4D ratio is predictive of homosexuality, but also that exposure to prenatal androgen is the root cause of both finger lengths and sexual orientation.
Not surprisingly, this claim is not widely accepted. There are many, many more claims out there. In , the BBC boldly reported that. That study found that men whose index fingers were longer than their ring fingers had a reduced risk of cancer.
I don't believe it for a second, but if it makes you feel better, go ahead. And a report found that both men and women with a low 2D:4D ratio longer ring fingers had better athletic abilities. The Science article goes on to explain, though, that "the results often can't be replicated. It didn't take me long to find a few, such as this study from , which swas the 2nd failure to replicate a result claiming a link between sex hormone exposure and the 2D:4D ratio.
The ratio of these digits' lengths could hint at everything from personality to intellect to physiology, a number of studies suggest. Here are some of the things a man's finger length may say about him. Men with short index fingers and long ring fingers tend to be nicer toward women, according to a new study, to be published in the March issue of the journal Personality and Individual Differences.
The finding could be a result of sex hormone exposure in the womb, scientists say. In the study, more than individuals 78 men and 77 women filled out forms for every social interaction with a member of the opposite sex lasting five minutes or longer in a three-week period, using a checklist of "agreeable" or "quarrelsome" behaviors. Men with small digit-ratios shorter index fingers relative to ring fingers engaged in roughly a third more agreeable behaviors toward women, and a third fewer quarrelsome ones, than men with large digit-ratios, the reports showed.
The more testosterone, the longer the ring finger grows.
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