Yawning when you see someone else yawn is known as contagious yawning.
Some studies suggest that mirror neurons, which are involved in mimicking or imitating actions we observe, might play a role in contagious yawning. When we see someone yawn, these neurons might activate, triggering our own yawn in response.
Other causes are
Empathy and Social Contagion: Yawning in response to seeing others yawn might be linked to empathy and social connections. It's suggested that this behavior is more common among people who are sensitive to others' emotions and social cues.
Social Communication: Yawning may serve as a nonverbal form of communication, indicating a shared physiological state or emotional connection. It could help in synchronizing group behavior or signaling relaxation.
Brain Cooling: Another theory suggests that yawning might help regulate brain temperature. Yawning could potentially help cool down the brain, and contagious yawning could be a way for groups to synchronize their arousal states.
