Why do we yawn when someone else yawns?

Yawning is a reflexive action often triggered by observing, reading about, or contemplating the act in others. This phenomenon manifests as an involuntary physical response, characterized by the opening of the jaw and the narrowing of the eyes.

The behavior suggests that yawning possesses an inherent, almost autonomous quality. The susceptibility to this contagious effect highlights a common human physiological response that occurs even in the absence of direct visual stimuli.