Contagious Yawning Decreases With Age
If you’ve noticed that you’re less likely now to start yawning when someone else does, you’re not alone. A study from Duke University that was published in the journal PLoS ONE found that “contagious yawning” may decrease with age.
Beyond that, however, the research failed to explain the phenomenon except to say that it is “not strongly related to variables like empathy, tiredness and energy levels”. The only independent factor that significantly influenced contagious yawning was age. As age increased, participants were less likely to yawn. However, age was only able to explain 8 percent of the variability in the contagious yawn response.
A release from Duke quotes study author Elizabeth Cirulli, Ph.D., assistant professor of medicine at the Center for Human Genome Variation at Duke University School of Medicine, as saying, “Age was the most important predictor of contagious yawning, and even age was not that important. The vast majority of variation in the contagious yawning response was just not explained.”
The release reports that the researchers said a better understanding of the biology involved in contagious yawning could ultimately shed light on illnesses such as schizophrenia or autism.
Contagious yawning is a well-documented phenomenon that occurs only in humans and chimpanzees in response to hearing, seeing or thinking about yawning. It differs from spontaneous yawning, which occurs when someone is bored or tired. Spontaneous yawning is first observed in the womb, while contagious yawning does not begin until early childhood.
Why certain individuals are more susceptible to contagious yawning remains poorly understood. Previous research, including neuroimaging studies, has shown a relationship between contagious yawning and empathy, or the ability to recognize or understand another’s emotions. Other studies have shown correlations between contagious yawning and intelligence or time of day.
Interestingly, people with autism or schizophrenia, both of which involve impaired social skills, demonstrate less contagious yawning despite still yawning spontaneously. A deeper understanding of contagious yawning could lead to insights on these diseases and the general biological functioning of humans.
The current study aimed to better define how certain factors affect someone’s susceptibility to contagious yawning. The researchers recruited 328 healthy volunteers, who completed cognitive testing, a demographic survey, and a comprehensive questionnaire that included measures of empathy, energy levels, and sleepiness.
The participants then watched a three-minute video of people yawning, and recorded the number of times they yawned while watching the video.