New study suggests contagious yawning is not linked to empathy.

While previous studies had suggested that there is connection between empathy and contagious yawning, But Duke Center do new research for Human Genome Variation and finds that contagious yawning may decrease with age and that is not related to variables like empathy, tiredness and energy levels.

“The lack of association in our study between contagious yawning and empathy suggests that contagious yawning is not simply a product of one’s capacity for empathy,” said Elizabeth Cirulli, Ph.D., assistant professor of medicine at the Center for Human Genome Variation at Duke University School of Medicine.

We can say the contagious yawning is a well-documented phenomenon that occurs only in humans and chimpanzees in response to seeing, hearing, or thinking about yawning. It somehow differs from spontaneous yawning that occurs when someone is tired or bored. Spontaneous yawning is first observed in the womb but contagious yawning does not begin until early childhood.

Certain individuals are more affected 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 been shown relations between intelligence and contagious yawning.

This is interesting that 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 latest study focused to better define how certain factors affect someone’s susceptibility to contagious yawning. The researchers recruited many healthy volunteers, who completed cognitive testing, a demographic survey, and a comprehensive questionnaire that included measures of empathy, sleepiness and energy levels.

The participants then watched a three-minute video of people yawning, and count the number of times they yawned while watching the video.

The researchers found that certain individuals were less susceptible to contagious yawns than others, with participants yawning between 0 and 15 to 20 times during the video. The get the result that 67.68 at least once. When this verified across multiple testing sessions, the number of yawns was consistent, demonstrating that contagious yawning is a very stable trait.

In contrast to previous studies, the researchers did not find a strong connection between contagious yawning and empathy, intelligence or time of day. 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% of the variability in the contagious yawn response.

“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,” Cirulli said.

Because most variability in contagious yawning remains unexplained, the researchers are now looking to see whether there are genetic influences that contribute to contagious yawning. Their long-term goal in characterizing variability in contagious yawning is to better understand human diseases like schizophrenia and autism, as well as general human functioning, by identifying the genetic basis of this trait.

“It is possible that if we find a genetic variant that makes people less likely to have contagious yawns, we might see that variant or variants of the same gene also associated with schizophrenia or autism,” Cirulli said. He also said that “Even if no association with a disease is found, a better understanding of the biology behind contagious yawning can inform us about the pathways involved in these conditions.”

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