A smile is a facial expression formed primarily by flexing the at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eye, an action known as a Duchenne smile.
Among , a smile expresses , socializing, happiness, joy, or amusement. It is distinct from a similar but usually involuntary expression of anxiety known as a . Although cross-cultural studies have shown that smiling is a means of communication throughout the world,[frown] there are large differences among different cultures, religions, and societies, with some using smiles to convey confusion, embarrassment, or awkwardness.
Evolutionary background
Primatologist Signe Preuschoft traces the smile back over 30 million years of evolution to a "fear grin" stemming from monkeys and apes, who often used barely clenched teeth to portray to predators that they were harmless
or to signal submission to more dominant group members. The smile may have evolved differently among species, especially among humans.
Social effects
Smiling seems to have a favorable
Social influence upon others and makes one
likable and more
approachable.
In the social context, smiling and
laughter have different functions in the order of sequence in social situations:
-
Smiling is sometimes a pre-laughing device and is a common pattern for paving the way to laughter;
-
Smiling can be used as a response to laughter.
As reinforcement and manipulation
The influence of smiling on others is not necessarily benign. It may take the form of positive reinforcement, possibly for an underhand manipulative and
abusive purpose.
Cultural differences
Researchers have found that smiling is more common in some cultures than other cultures. For example, smiles are more common the U.S. and France than in China or Japan.
This pattern has been found in posed photos, such as the smiles of political leaders in official pictures
and of students in school ID photos.
It has also been found when researchers observed rates of smiling in everyday life.
While smiling is perceived as a positive emotion most of the time, there are many cultures that perceive smiling as a negative expression and consider it unwelcoming. Too much smiling can be viewed as a sign of shallowness or dishonesty.
Systematic large cross-cultural study on social perception of smiling individuals
There can also be gender differences. In the United States and Canada, women report men telling them to smile. For example, Greg Rickford, a member of the Canadian Parliament, told a female journalist to smile rather than answer the question she had asked.
Dimples
Dimple are formed secondary to a bifid zygomaticus major muscle, whose fascial strands insert into the dermis and cause a dermal tethering effect.
Dimples are genetically inherited and are a dominant trait.
Having bilateral dimples (dimples in both cheeks) is the most common form of cheek dimples.
A rarer form is the single dimple, which occurs on one side of the face only.
This bifid variation of the muscle originates as a single structure from the zygomatic bone. As it travels anteriorly, it then divides with a superior bundle that inserts in the typical position above the corner of the mouth. An inferior bundle inserts below the corner of the mouth. Dimples are analogous and how they form in cheeks varies from person to person. The shape of a person's face can affect the look and form as well:
Duchenne smile
While conducting research on the
physiology of facial expressions in the mid-19th century, French neurologist Guillaume Duchenne identified two distinct types of smiles. A Duchenne smile involves contraction of both the zygomatic major muscle (which raises the corners of the mouth) and the orbicularis oculi muscle (which raises the cheeks and forms crow's feet around the eyes). The Duchenne smile has been described as "smizing", as in "smiling with the eyes".
[ ] An exaggerated Duchenne smile is sometimes associated with lying.
Non-Duchenne smile
A non-Duchenne smile involves only the zygomatic major muscle.
[Duchenne, Guillaume (1990). The Mechanism of Human Facial Expression. New York: Cambridge University Press. Translated by R. Andrew. Originally published as Mecanisme de la Physionomie Humaine in 1862.] According to Messenger
et. al., "Research with adults initially indicated that joy was indexed by generic smiling, any smiling involving the raising of the lip corners by the zygomatic major .... More recent research suggests that smiling in which the muscle around the eye contracts, raising the cheeks high (Duchenne smiling), is uniquely associated with positive emotion."
The "Pan Am smile", also known as the "Botox smile", is the name given to a fake smile, in which only the zygomatic major muscle is voluntarily contracted to show politeness. It is named after the now-defunct airline Pan American World Airways, whose flight attendants would always flash every passenger the same perfunctory smile.
Other animals
In other animals, the baring of teeth is often used as a
threat display—known as a
snarl—or a sign of
submission. For chimpanzees, it can also be a sign of
fear. However, not all animal displays of teeth convey negative acts or emotions. For example,
demonstrate an open mouth display as a sign of playfulness, which likely has similar roots and purposes as the human smile.
See also
Further reading
-
Ottenheimer, H.J. (2006). The anthropology of language: An introduction to linguistic anthropology. Belmont, CA: Thomson Wadsworh.
-
Cited in: Russell and Fernandez-Dols, eds. (1997).
-
Russell and Fernandez-Dols, eds. (1997). The Psychology of Facial Expression. Cambridge. .
External links
