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Facial Action Coding System
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<p>The Facial Action Coding System (FACS) is a system to <a href="/facts/Taxonomize/Qkg8wuyw">taxonomize</a> human <a href="/facts/Facial_expression/polSzUsf">facial movements</a> by their appearance on the face, based on a system originally developed by a Swedish <a href="/facts/Anatomist/p8TCWJuV">anatomist</a> named <a href="/facts/Carl-Herman_Hjortsj%C3%B6/jlkuwuJW">Carl-Herman Hjortsjö</a>. It was later adopted by <a href="/facts/Paul_Ekman/Yq2AdToD">Paul Ekman</a> and Wallace V. Friesen, and published in 1978. Ekman, Friesen, and Joseph C. Hager published a significant update to FACS in 2002. Movements of individual <a href="/facts/Facial_muscles/f6JuRrgG">facial muscles</a> are encoded by the FACS from slight different instant changes in facial appearance. It has proven useful to <a href="/facts/Psychologist/J4l4QdX2">psychologists</a> and to <a href="/facts/Animator/A1yVPjVn">animators</a>. </p>