Say Cheese!
We all want to look our best in pictures, and our 1 are a big part of that. But when we try to say "cheese", the resulting smile is often not as natural as our real happy face. So, why can't we smile 2 in photographs?
In 1862, French scientist Guillaume Duchenne studied facial expressions and their links to emotions. He described a 3 smile of great joy. This "real" smile is a smiling mouth with smiling eyes. It activates the brain areas that process emotions. A"real"smile 4 crow's feet (鱼尾纹) around the eyes and pulls the cheeks up. This smile is now known as the Duchenne smile.
When we see a smile like this, we recognize it as an expression of true happiness. But a smile made for a photograph is 5 .This is because the brain creates these two types of smiles in different ways.
A"fake"smile doesn't activate the emotional areas of the 6 Instead, it activates a motor neural pathway(运动神经路径).In other words, only your muscles respond to this kind of smile. Your brain knows that a smile should make your mouth 7 , so it activates those muscles. But when you make this type of"fake" smile, you aren't using all of the muscles involved in a natural smile.
The Duchenne smile is widely considered the true smile of happiness. However, some people can mimic(模仿)it, either in a photo or in real life. You've probably seen people do this. Actors, for example, spend a lot of time 8 their perfect smile for the camera.
In a study, researchers asked people to 9 in front of a camera. Over 70 percent of them could successfully mimic a Duchenne smile. For most of us, this is good news. With a little practice, we could all look 10 in our photographs, even if we're feeling blue.
