why are yawns contagious

Yawns are contagious primarily due to a neurological mechanism involving mirror neurons in the brain. These neurons activate when observing others yawn, prompting a similar reflex in the observer. This contagious yawning may have an evolutionary basis to synchronize group behavior and boost vigilance to threats within social groups. Additionally, contagious yawning is stronger between individuals who have closer social bonds or emotional connections, suggesting a link to empathy. This phenomenon is not limited to humans but is seen in some animals as well, showing its broader social and evolutionary importance.