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Science Explains Why Smiles Are Infectious

Science Explains Why Smiles Are Infectious

It is fairly common knowledge that smiles are contagious. Smiling makes everyone in the room feel better because they, consciously or unconsciously, are smiling with you.

Emerging research suggests an instinct for facial mimicry allows us to empathize with and even experience other people’s feelings. If we can’t mirror another person’s face, it limits our ability to read and properly react to their expressions.

This concept of emotional mirroring is discussed in a new paper found in the journal Trends in Cognitive Sciences.

In the review, Paula Niedenthal and Adrienne Wood, social psychologists at the University of Wisconsin, and colleagues describe how people in social situations simulate others’ facial expressions to create emotional responses in themselves.

For example, if you’re with a friend who looks sad, you might “try on” that sad face yourself — without realizing you’re doing so.

In “trying on” your friend’s expression, it helps you to recognize what they’re feeling by associating it with times in the past when you made that expression. Humans are able to extract this emotional meaning from facial expressions in a matter of only a few hundred milliseconds.

“You reflect on your emotional feelings and then you generate some sort of recognition judgment, and the most important thing that results is that you take the appropriate action — you approach the person or you avoid the person,” Niedenthal says.

“Your own emotional reaction to the face changes your perception of how you see the face, in such a way that provides you more information about what it means.”

Unfortunately, the ability to use mimicry to interpret emotions is sometimes compromised.

For example, a person’s ability to recognize and “share” others’ emotions can be inhibited when they can’t mimic faces. This can occur from something as simple as long-term pacifier use or a symptom related to a neurological condition. This is a common complaint for people with facial paralysis from a stroke or Bell’s palsy — or even due to nerve damage from plastic surgery.

Niedenthal notes that the same would not be true for people with congenital paralysis, because if you’ve never had the ability to mimic facial expressions, you will have developed compensatory ways of interpreting emotions.

People with social disorders associated with mimicry and/or emotion-recognition impairments, like autism, can experience similar challenges.

“There are some symptoms in autism where lack of facial mimicry may in part be due to suppression of eye contact,” Niedenthal says. In particular, “it may be overstimulating socially to engage in eye contact, but under certain conditions, if you encourage eye contact, the benefit is spontaneous or automatic facial mimicry.”

Niedenthal says that future research will explore brain mechanisms that are help with facial expression recognition.

A better understanding of the mechanism behind sensorimotor simulation, she says, will give us a better idea of how to treat related disorders.

Source: Cell Press/EurekAlert

Science Explains Why Smiles Are Infectious

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2018). Science Explains Why Smiles Are Infectious. Psych Central. Retrieved on September 25, 2020, from
Scientifically Reviewed
Last updated: 8 Aug 2018 (Originally: 12 Feb 2016)
Last reviewed: By a member of our scientific advisory board on 8 Aug 2018
Published on Psych All rights reserved.