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For example raising the inner portion of the eyebrows can produce horizontal wrinkles which are usually limited to the center of the forehead. To continue the previous example, 1E+2E represents extreme (or maximal) raising of the inner and outer portions of the eyebrows.īesides representing facial movements, action units will also create changes in facial appearances. raising the entire eyebrow.)įACS also includes a system to describe the intensity of each AU by affixing a letter A through E after the numeric code but before the plus sign. For example 1+2 represents raising the inner and outer portions of the eyebrow (i.e. Multiple FACS codes are strung together using plus (?+?) signs. The act of describing facial movements using the Facial Action Coding System is called FACS coding (or scoring). The mapping between AUs and facial muscles is not necessarily 1-to-1 some AUs are composed of more than one muscle, and other AUs describe separate movements of the same muscle. 2 Stated another way, an action unit is a numeric code to describe the movements of facial muscles. (AU) An AU represents the muscular activities that produce momentary changes in facial appearances.
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The basic unit of measurement in FACS is the action unit.
Download Paul Ekman Facial Action Coding System Pdf manual#
Joseph Hager, the latest version of the FACS manual can be purchased online at face and emotion. This means FACS can be used to describe any possible set of facial movements. 1 FACS is an anatomically-based comprehensive system. The Facial Action Coding System (FACS) is a scientific system designed to measure human facial movements. Paul Ekman - Facial Action Coding System (FACS) | IMG | 805 MB