Question: why are yawns infectious?

Poonam Kaushik answered on 14 Jun 2010:

Yawn is a reflex of simultaneous inhalation of air and stretching of the eardrums, followed by exhalation of breath. Observing another person’s yawning face (especially his/her eyes), even reading, or thinking about yawning, or looking at a yawning picture can cause a person to yawn.The proximate cause for contagious yawning may lie with mirror neurons, i.e., neurons in the frontal cortex of certain vertebrates, which upon being exposed to a stimulus from conspecific (same species) and occasionally interspecific organisms, activates the same regions in the brain. Mirror neurons have been proposed as a driving force for imitation which lies at the root of much human learning, e.g., language acquisition. Yawning may be an offshoot of the same imitative impulse.

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