Facial Action Coding System Case Study

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Chapter 2 Facial Action Coding System (FACS) 2.1 What is Facial Action Coding System? Facial Action Coding System (FACS) is the most widely used and versatile method for measuring and describing facial behaviors. Paul Ekman andWallace V. Friesen, psychologists developed the FACS in the 1970. The Facial Action Coding System (FACS) research tool is an sophisticated, internationally recog- nized, that precisely measures the entire spectrum of human facial expressions. The minutest movements of the human face , FACS remains the acclaimed and most widely used method for coding. FACS has clari ed the physiological pres- ence of emotion with very high levels of reliability. It has predicted patterns which related to deception at about 80. Determining…show more content…
In 1978, Manual of the Facial Action Coding System was rst published in a loose-leaf version with video supplements. All facial expressions can be decomposed into their constituent AUs and described by duration, intensity, and asymmetry. FACS measurement units are Action Units (AUs), Muscles are not measurements units of FACS .There are two reasons. First, More than one muscle was combined into a single AU because the changes in appearance they produced could not be distinguished, for a few appearances And secondly, By the appearance changes produced by one muscle were sometimes separated into two or more AUs that represent relatively independent actions of di erent parts of the muscles. Facial muscles were not identi ed and named by behav- ioral psychologists. Facial muscles were identi ed and named by anatomists. Muscle combinations involved in each of the universal facial expressions. There are also subtle expressions of emotion. macro facial expressions or emotions, which are obvious expressions meant to openly communicate one's feelings…show more content…
 FACS can capture emotional reactions during both speaking and non- 9 speaking occurrences. The face emotes not only while a person is speaking but also while they are listening, observing or silently engaging. Record- ing visible and involuntary reactive emoting during non-speaking segments provides a host of valuable information about a person's state of mind. FACS can capture intimate information about a subject's emotional reac- tions while listening, observing or engaging in a task. 2.4 Applications of FACS  FACS has been used to distinguish Duchenne smiles from social smiles, here Duchenne means genuine and social means fake smile. The speci city of FACS coding reveals the anatomical elements which make it dicult to fake a Duchenne smile. While the the social smile involves the contrac- tion of a singular facial muscle, the Duchenne smile is activated by the involuntary movement of multiple muscle groupings.  It has also been an integral part of the research into , consumer engage- ment, deception detection, psychological states such as pain, interpersonal communication computer animation

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