What key feature helps us tell the difference between a genuine smile and a fake smile?
A) a crease appears on the forehead
B) the corners of the mouth curve up
C) most of the top teeth show
D) a small crinkle appears at the corners of the eyes

Question

Quizplus · Accepted Answer

A genuine smile, often called a Duchenne smile, involves the contraction of the orbicularis oculi muscle, which produces the characteristic crinkles at the corners of the eyes. This is not typically present in a fake smile.

What Key Feature Helps Us Tell the Difference Between a Genuine