Facial expressions don't tell the whole story of emotion

by Laura Arenschield, The Ohio State University

"Some claim they can detect whether someone is guilty of a crime or not, or whether a student is paying attention in class, or whether a customer is satisfied after a purchase," he said. "What our research showed is that those claims are complete baloney. There's no way you can determine those things. And worse, it can be dangerous."...
After analyzing data about facial expressions and emotion, the research team—which included scientists from Northeastern University, the California Institute of Technology and the University of Wisconsin—concluded that it takes more than expressions to correctly detect emotion.
Facial color, for example, can help provide clues.
"What we showed is that when you experience emotion, your brain releases peptides—mostly hormones—that change the blood flow and blood composition, and because the face is inundated with these peptides, it changes color," Martinez said.
The human body offers other hints, too, he said: body posture, for example. And context plays a crucial role as well.,,,,https://techxplore.com/news/2020-02-facial-dont-story-emotion.html