Eyebrow

Eyebrow

The eyebrow is an area of thick, delicate hairs above the eye that follows the shape of the lower margin of the brow ridges of some^[which?] mammals. Their main function is to prevent sweat or water, and other debris, from falling down into the eye socket,^{[citation needed]} but they are also important to human communication and facial expression.^[1] It is not uncommon for people – women in particular – to modify their eyebrows by means of hair addition, removal, make up, or piercings.

The main function of the eyebrow is to prevent moisture, mostly salty sweat and rain, from flowing into the eye. The typical curved shape of the eyebrow (with a slant on the side) and the direction in which eyebrow hairs are pointed, make sure that moisture has a tendency to flow sideways around the eyes, along the side of the head and along the nose. The slightly protruding brow ridges of modern humans could also still play a supporting role in this process in this way it helps them make expressions.^{[citation needed]} Together with the brow ridges, the eyebrows also shade the eyes from sunlight. Eyebrows also prevent debris such as dandruff and other small objects from falling into the eyes, as well as providing a more sensitive sense for detecting objects being near the eye, like small insects.

Psychological

Eyebrows also have an important facilitative function in communication, strengthening expressions, such as surprise or anger. Many makeup artists view eyebrows as a major feature in defining the face. The eyebrows shape the human face and give definition to one's eyes and forehead. Depending on the shape of the eyebrows, it sometimes can cause what is known as a false facial expression (such as a person's eyebrows shaped to seem as if the person was angry, but really isn't).

Identification

In a study published by MIT, where subjects were asked to identify celebrities with either their eyes or their eyebrows digitally edited out, the subjects were able to recognize the celebrity 46% of the time with their eyebrows edited out, compared to 60% of the time with their eyes edited out. The findings indicate the importance of eyebrows in providing cues to an individual's identity.^[2]