Science of Love, Sex, and Babies

The Real Purpose of Eyebrows?

Posted in psychology, science by jenapincott on July 4, 2011

Human faces are relatively flat. Alas, evolution has flattened the jutting jaw and the bulging brow ridge. 

Fortunately, we still have one reliable landmark:  the eyebrow.

According to a study by MIT behavioral neuroscientist Javid Sadr and his colleagues, eyebrows have remained because they are crucial to facial identification. Faces without eyebrows are like land without landmarks.

The study:  Volunteers were asked to identify fifty famous faces, including that of former U.S. president Richard Nixon and actor Winona Ryder.  The photos were digitally altered and displayed either without eyebrows or without eyes. When celebrities lacked eyes, subjects could recognize them nearly 60 percent of the time.  However, when celebrities lacked eyebrows, subjects recognized them only 46 percent of time.

The lesson:  eyebrows are crucial to facial identity — they’re at least as important as your eyes, if not more so.  If you put colored contacts in your eyes, pumped collagen into your lips, or put on a pair of funky sunglasses, people would probably still recognize you easily.  But try shaving off your eyebrows. Chances are that everyone will say they didn’t recognize you at first glance.

As Sadr points out, eyebrows pop out against the backdrop of your face — and for that reason not only identify who you are but how you’re feeling. Along with the lips, they may in fact be the most expressive part of your body. The single raised eyebrow is a universal sign of skepticism, and the dual raised eyebrow a sign of surprise.

The shape of your eyebrows also reveals, in a glance, a lot about your age and other characteristics.  Bushy, gnarly, salt-and-pepper brows:  older apha males. Thin, graceful arcs:  young, stylish women.  Sparse, light brows:  youths.  Waxed and tweezed, the brow can advertise good grooming.

Eyebrows sometimes meet each other halfway across the bridge of the nose, especially on men, to form a monobrow, which resembles the vanished browridge of our primate ancestors.  Distinctive? Yes, and also brow-raising.

 *This entry was previously published on this blog. If you wish, also check out my forthcoming book, Do Chocolate Lovers Have Sweeter Babies: The Surprising Science of Pregnancy. 

2 Responses

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  1. Joseph Danrock said, on July 19, 2011 at 1:45 pm

    Never thought about this function of eyebrows…. Face reading experts have underlined the fact that the shape of the eyebrow shows certain information about the character of the observed person.
    I guess face reading will still amaze us…

  2. Anonymous said, on September 21, 2011 at 7:50 pm

    Experts also say eyebrows play a role with the eyebrows as well. Studies suggest Neanderthals had unibrows, as well as other cavemen. We think that most humans lost them when we lost most of our other body hair.


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