The intensity of each facial action AU is documented on a five-point intensity scale.
There are numeric codes for each AU to identify the muscle or muscle groups being contracted or relaxed, which create the changes in appearance that are observed, providing the ability to analyze minuet facial motions. Friesen with the intention of objectively measuring facial expressions for behavioral science investigations (Ekman, Friesen, 1978 Ekman, Friesen, Hager, 2002).īefore the development of FACS, a standard system for facial measurement was nonexistent this was highly problematic in collecting reliable scientific data within the field.įACS is anatomically based and is comprised of 44 distinct Action Units (AUs), which correspond to each motion of the face, along with several sets of head and eye movements and positions. It was developed by psychologists Paul Ekman and Wallace V. The Facial Action Coding System (FACS) is the most widely acknowledged, comprehensive, and credible system of measuring visually discernable facial movements.
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