text: Does expression in the mirror suggest an emotion? of course you can tell what emotion what others is showing in the mirror. Can computer tell what emotion does a person is showing by just looking at it of course not. Can technology indicate the difference between a genuine smile and forced one. I don't think computer can detect a fake smile because it didn't say that the new technology can tell if a person is showing fake smile or real smile. whoever thought that making making faces could reveal so much about the science of emotion.