Your smile, in particular, is a double-edged sword, conveying both underlying and surface-level emotions during social interaction, according to a 2022 study published in Frontiers in Psychology.

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 ...

The research is published in the journal PLOS ONE. There are many different types of smile, and the researchers, including Professor Patrick Stewart from the University of Arkansas, Professor Erik ...