There are many different types of smile, and the researchers, including Professor Patrick Stewart from the University of Arkansas, Professor Erik Bucy from Texas Tech University and Professor Nick ...
Furthermore, the facial expression software used could detect smiles, but it could not differentiate between different types ...
Humans can produce thousands of distinct facial expressions – including 19 different types of smile, according to research by the American psychologist Paul Ekman. However, only one of these is ...