text: Computers may have a code that help identify the facial expressions, but some humans don't really show much facial expression on how they are feeling. For example, "" Most human communication is nonverbal, including emotional communication," notes Dr. Huang. "So computers need to understand that, too" (Paragraph 6). However, humans who do not show a great amount of facial expressions can still show a slight amount, which would be enough for the computer to detect. It can also detect when you are showing false facial expressions because they are more strained than genuine. For example, " It's all about those muscular action units. They even indicate the difference between a genuine smile and a forced one. In the real smile, the zygomatic major (muscles that begin at you cheek bones) lift the corners of your mouth" (Paragraph 7). It can also figure out if it's a genuine smile by looking for crow's-feet, which are wrinkles around the corners of your eyes.