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On the beach. A fleeting change in someone's face or body language can signal a lot of different emotions.

Why do people's faces change when they're angry or sad?

In this episode, we speak with a psychologist and expert in facial expressions, gestures, and other nonverbal behavior about how not speaking can speak volumes.

I'm Audrey Hamilton, and this is Speaking of Psychology.

Thank you. David Matsumoto is a professor of psychology and director of the culture and emotion research laboratory at San Francisco State University.

An expert on facial expressions, nonverbal behavior and deception, he is director of Humintel, a company that conducts research and training

for organizations such as the Transportation Security Administration, the FBI, and the U.S.

Marshals Service. Welcome, Dr. Matsumato. Thank you for having me. We are probably all familiar

with the universal facial expressions of our emotions, you know, anger, joy, sadness, you know,

those are some of them. Can you give examples of some of the less obvious facial expressions?

I think you call them micro expressions, you know, where someone is maybe attempting to conceal his or her emotions.

These are much harder to detect. Is that right?

Micro expressions are unconscious, extremely quick, sometimes full-face expressions of an emotion.

And sometimes they're partial and very subtle expressions of emotion.

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