Using FACS, human coders can manually code nearly any anatomically possible facial expression, decomposing it into the specific AUs and their temporal segments that produced the expression. The website of Paul Ekman' lab refers to it as the "new" FACS. It is still simply known as FACS, not as FACS2, FACS 2002 revision or FACS version 2. Unfortunately, the authors decided not to rename the system.
|title=Facial action coding system |publisher=A Human Face |location=Salt Lake City, UT |year=2002 |pages= |isbn=0-93 |oclc= |doi=] Most co-occurrence rules were removed, a number of AUs were removed and some added, minimum requirements were eliminated and a novel intensity scoring definition was introduced. In 2002, a new version of FACS was finally published, with large contributions by Joseph Hager. However, as changes became more structural, a new version of FACS was needed. At first the changes were handed out to the new FACS coders in form of an addendum. While using the system for several years in their lab and training new FACS coders, they updated the rules and definitions of the system. The original FACS was published in 1976 by Paul Ekman and Wallace V. Hjortsjö was professor of Anatomy at Lund University in Sweden. It is a common standard to systematically categorize the physical expression of emotions, and it has proven useful to psychologists and to animators.įACS and its "action units" (AUs) are based on the book of Carl-Herman Hjortsjö "Man's Face and Mimic Language". Facial Action Coding System (FACS) is a system to taxonomize human facial expressions, originally developed by Paul Ekman and Wallace Friesen in 1976.