text: The program uses muscle identification to determine what emotion the person is making. A specific muscle is used to make an emotion. For example, the zygomatic major is used to move the lips up to make a smile. The zygomatic major and the risorius is used to force a smile like if you feel awkward, depressed, or upset but doesn't want to show it. So even the program can tell if you are forcing a smile or you are actually happily smiling.