Here's a thought on a piece of my research. How do you detect emotions?

A couple of years ago, I did research on emotions eventhough I already knew so much about it but here is what I stumbled upon during that time...

"Americans detect a person's emotions by looking at his or her mouth, says a new study. Other cultures, like the Japanese focus more on the eyes."

Isn't that quite interesting or what?

I don't focus on the mouth, I focus on the eyes but, at the same time, I can read emotions through words too. Be it typed or spoken. Spoken words, I can sometimes look behind the sound of a persons voice, but that doesn't mean I'm focusing on the mouth. It's sound.