Muscles of head and neck The Facial Action Coding System (FACS) is a system to taxonomize human facial movements by their appearance on the face, based on a system originally developed by a Swedish anatomist named Carl-Herman Hjortsjö.[1] It was later adopted by Paul Ekman and Wallace V. Friesen, and published in 1978.[2] Ekman, Friesen, and Joseph C. Hager published a significant update to FACS i
What are the FACS Manual and Investigator's Guide? The Facial Action Coding System (FACS) Manual is a detailed, technical guide that explains how to categorize facial behaviors based on the muscles that produce them, i.e., how muscular action is related to facial appearances. It illustrates appearance changes of the face using written descriptions, still images, and digital video examples. Be
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