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Source:
الصحة والعلوم الشرق الأوسط
Why is yawning contagious
Yawning is a common phenomenon that spreads among people. Its cause is believed to be a way to help regulate brain temperature or boost alertness. Contagious yawning may be linked to imitating the behaviors of others and the mirror neurons in the brain. Although science has not yet identified a definitive reason for this phenomenon, seeing someone yawn can automatically trigger yawning in others. This is considered part of a synchronized group behavior that helps maintain wakefulness and alertness.
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