Facial expressions are central to social life, yet scientists still don’t fully understand how the brain produces them. To ...

It’s intentionally sending a signal that it’s pissed off, so beware ...

Long-standing research in human psychology has claimed that certain facial expressions of emotion are universal across cultures. For example, classic cross-cultural studies by Paul Ekman and ...

The human facial action coding system, or FACS, has been developed as a tool for cross-species systematic comparisons of facial muscles to help interpret the resulting facial expressions of the common ...