Nav: Home

Facial models suggest less may be more for a successful smile

June 28, 2017

Research using computer-animated 3D faces suggests that less is more for a successful smile, according to a study published June 28, 2017 in the open-access journal PLOS ONE by Nathaniel Helwig from the University of Minnesota, US, and colleagues.

Facial cues are an important form of nonverbal communication in social interactions, and previous studies indicate that computer-generated facial models can be useful for systematically studying how changes in expression over space and time affect how people read faces. The authors of the present study presented a series of 3D computer-animated facial models to 802 participants. Each model's expression was altered by varying the mouth angle, extent of smile and the degree to which teeth were on show, as well as how symmetrically the smile developed, and participants were asked to rate smiles based on effectiveness, genuineness, pleasantness and perceived emotional intent.

The researchers found that a successful smile - one that is rated effective, genuine and pleasant - may contradict the "more is always better" principle, as a bigger smile which shows more teeth may in fact be perceived less well. Successful smiles therefore have an optimal balance of teeth, mouth angle and smile extent to hit a smile 'sweet spot'. Smiles were also rated as more successful if they developed quite symmetrically, with the left and right side of the faces being synced to within 125 milliseconds.

According to the authors, using 3D computer amination may help to develop a more complete spatiotemporal understanding of our emotional perceptions of facial expression. Since some people have medical conditions such as stroke which hinder facial expressions, with possible psychological and social consequences, these results could also inform current medical practices for facial reanimation surgery and rehabilitation.
-end-
In your coverage please use this URL to provide access to the freely available article in PLOS ONE: http://journals.plos.org/plosone/article?id=10.1371/journal. pone.0179708

Citation: Helwig NE, Sohre NE, Ruprecht MR, Guy SJ, Lyford-Pike S (2017) Dynamic properties of successful smiles. PLoS ONE 12(6): e0179708. https://doi.org/10.1371/journal.pone.0179708

Funding: This work was supported by faculty start-up funds from the University of Minnesota (NEH, SJG, SL-P).

Competing Interests: The authors have declared that no competing interests exist.

PLOS

Related Teeth Articles:

Orangutans suckle for up to eight years, teeth reveal
Researchers have developed a method for tracking characteristically elusive nursing patterns in primates and used it to discover that some immature orangutans suckle for eight years or more -- exceeding the maximum weaning age reported for other non-human primates.
What makes a man-eater? Check the teeth
The man-eating lions of Tsavo killed dozens in 1898, and scientists are still investigating the lions' bones for clues as to why.
What teeth reveal about the lives of modern humans
When anthropologists of the future find our fossilized teeth, what will they be able to conclude about our lives?
No teeth? No problem -- dinosaur species had teeth as babies, lost them as they grew
Researchers have discovered that a species of dinosaur, Limusaurus inextricabilis, lost its teeth in adolescence and did not grow another set as adults.
These dinosaurs lost their teeth as they grew up
By comparing the fossilized remains of 13 ceratosaurian theropod dinosaurs known as Limusaurus inextricabilis collected from the Upper Jurassic Shishugou Formation of northwestern China, researchers have been able to reconstruct the dinosaur's growth and development from a young hatchling of less than a year to the age of 10.
A handful of photos yields a mouthful of (digital) teeth
A Disney Research team has developed a model-based method of realistically reconstructing teeth for digital actors and for medical applications using just a few, non-invasive photos or a short smartphone video of the mouth.
Tiny new fossil crocodile-relative had mammal-like teeth
In the dinosaur-rich fossil beds of Morocco, dated to about 100 million years ago, scientists have discovered a strange new crocodile.
Hippo teeth reveal environmental change
Loss of megaherbivores such as elephants and hippos can allow woody plants and non-grassy herbs and flowering plants to encroach on grasslands in African national parks, according to a new University of Utah study, published Sept.
Unlocking the mystery on how plant leaves grow their teeth
Plant biologists at ITbM, Nagoya University have discovered the key element, an EPFL2 peptide that is responsible for creating the teeth-like shapes on plant leaves.
Changes in primate teeth linked to rise of monkeys
UC Berkeley's Leslea Hlusko searches for simple inherited dental characteristics that could lead to genes controlling tooth development, and has ucovered an easy-to-measure trait that tracks primate evolution over the last 20 million years, shedding light on the mysterious decline of apes and the rise of monkeys 8 million years ago.

Related Teeth Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Don't Fear Math
Why do many of us hate, even fear math? Why are we convinced we're bad at it? This hour, TED speakers explore the myths we tell ourselves and how changing our approach can unlock the beauty of math. Guests include budgeting specialist Phylecia Jones, mathematician and educator Dan Finkel, math teacher Eddie Woo, educator Masha Gershman, and radio personality and eternal math nerd Adam Spencer.
Now Playing: Science for the People

#517 Life in Plastic, Not Fantastic
Our modern lives run on plastic. It's in the computers and phones we use. It's in our clothing, it wraps our food. It surrounds us every day, and when we throw it out, it's devastating for the environment. This week we air a live show we recorded at the 2019 Advancement of Science meeting in Washington, D.C., where Bethany Brookshire sat down with three plastics researchers - Christina Simkanin, Chelsea Rochman, and Jennifer Provencher - and a live audience to discuss plastics in our oceans. Where they are, where they are going, and what they carry with them. Related links:...