You are watching a beauty pageant on television,and they have just announced the winner and first-runner-up.Both women are smiling,but the winner appears to have little "crow's feet" or crinkles in the outside corners of her eyes,while the first runner-up does not.The winner is displaying a

Question

Quizplus · Accepted Answer

The Duchenne smile involves not only the movement of the zygomatic major muscle (raising the corners of the mouth) but also the contraction of the orbicularis oculi muscles, which creates the "crow's feet" or crinkles in the outside corners of the eyes. Therefore, the winner's smile is a Duchenne smile, while the first runner-up's smile is only a social smile, which involves only the movement of the zygomatic major muscle.

You Are Watching a Beauty Pageant on Television,and They Have