The 16 facial expressions most common to emotional situations worldwide

Facial expressions of emotion transcend geography and culture, new study shows. (Image by Alan Cowen) Whether at a birthday party in Brazil, a funeral in Kenya or protests in Hong Kong, humans all use variations of the same facial expressions in similar social contexts, such as smiles, frowns, grimaces and scowls, a new UC Berkeley study shows. The findings, published today, Dec. 16, in the journal Nature , confirm the universality of human emotional expression across geographic and cultural boundaries at a time when nativism and populism are on the rise around the world. "This study reveals how remarkably similar people are in different corners of the world in how we express emotion in the face of the most meaningful contexts of our lives," said study co-lead author Dacher Keltner, a UC Berkeley psychology professor and founding director of the Greater Good Science Center. Researchers at UC Berkeley and Google used machine-learning technology known as a "deep neural network" to analyze facial expressions in some 6 million video clips uploaded to YouTube from people in 144 countries spanning North, Central and South America, Africa, Europe, the Middle East and Asia. "This is the first worldwide analysis of how facial expressions are used in everyday life, and it shows us that universal human emotional expressions are a lot richer and more complex than many scientists previously assumed," said study lead author Alan Cowen, a researcher at both UC Berkeley and Google who helped develop the deep neural network algorithm and led the study.