By contrast, we predicted that people in cultures where overt emotional expression is the norm (such as the US) would tend to interpret emotions based on the position of the mouth, because it is ...

In our research, we uncovered the presence of a distinct facial display, the open mouth, in bottlenose dolphins. This expression is most commonly observed during playful interactions with other ...

New research publishing October 2 in the Cell Press journal iScience shows that bottlenose dolphins (Tursiops truncates) use the “open mouth” facial expression—analogous to a smile—to ...

Laughter’s evolutionary story may be written on chimpanzees’ faces. Chimps at play make open-mouth facial expressions while either laughing out loud or staying silent, say psychologist Marina ...