“Yawning is contagious because of empathy”

The phenomenon of "catching" a yawn from another person is a widely recognized experience, often leading to the intuitive belief that it stems from a shared emotional state or empathy. People frequently notice they are more susceptible to yawning contagiously when around close friends (Review) or family, reinforcing the idea that a deeper connection is at play. This common observation has fueled the popular notion that contagious yawning is a direct measure of our ability to empathize with others.

Scientific inquiry into contagious yawning has indeed found correlations with empathy. Studies show that this behavior typically emerges in children around four or five years old, a developmental stage associated with the onset of empathy. Furthermore, research indicates that the likelihood of catching a yawn increases with the emotional closeness between individuals, meaning you're more prone to yawn if a loved one does compared to a stranger. Brain imaging studies have also pointed to the involvement of mirror neurons and brain regions linked to empathy during contagious yawning, suggesting a neurological basis for this connection.

However, the full picture is more complex, and the mechanism isn't entirely clear. While many studies support a link, some research has not found a strong correlation between contagious yawning and empathy in adults, with age sometimes being a more significant factor. Contagious yawning is also observed in various social animals, and even some less social species, suggesting it might serve broader social functions beyond just empathy, such as synchronizing group behavior or nonconscious mimicry, where individuals imitate actions without realizing it. Therefore, while empathy likely plays a role, it's not the sole or fully understood explanation for why yawns are contagious.