What is the cause of yawning?

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Yawning

Q. What is the cause of yawning?

A. Physiologists tell us that in the middle of the upper portion of the spinal cord there is a small nerve center which has charge of the back movement or group of movements which we call yawning. Just what brings this center into action nobody knows. It is a curious fact, however, that the disposition to yawn seems to be to a certain extent infectious. If one of a group of persons yawns another member of the group is almost certain to yawn a few minutes later. Yawning generally occurs when a per­son is weary or drowsy. Many persons are in­clined to yawn after eating. Bathing the face with cold water, drinking a glass of hot or cold water or some refreshing beverage will generally cause the disposition to yawn to disappear.

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