How were Action Units (AUs) discovered?

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Action units are discussed in the Investigator’s Guide, available for purchase on the FACS page. The anatomist Hjorstjo (1970) did important groundwork in identifying the units of action based on facial muscle groups on which Ekman and Friesen built in developing FACS as a measurement system.

Paul Ekman is a well-known psychologist and co-discoverer of micro expressions. He was named one of the 100 most influential people in the world by TIME magazine in 2009. He has worked with many government agencies, domestic and abroad. Dr. Ekman has compiled over 50 years of his research to create comprehensive training tools to read the hidden emotions of those around you.
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