Posted on 2011-08-11. By anonymous.
Facial Action Coding System (FACS)
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Facial Action Coding System (FACS) is a system to taxonomize human facial expressions, originally developed by Paul Ekman and Wallace Friesen in 1976. It is a common standard to systematically categorize the physical expression of emotions, and it has proven useful to psychologists and to animators.
P. Ekman and W. Friesen. Facial Action Coding System: A Technique for the Measurement of Facial Movement. Consulting Psychologists Press, Palo Alto, 1978.
Using FACS, human coders can manually code nearly any anatomically possible facial expression, deconstructing it into the specific Action Units (AU) and their temporal segments that produced the expression. As AUs are independent of any interpretation, they can be used for any higher order decision making process including recognition of basic emotions, or pre-programmed commands for an ambient intelligent environment. The FACS Manual is over 500 pages in length and provides the AUs, as well as Dr. Ekman's interpretation of their meaning.
FACS defines AUs, which are a contraction or relaxation of one or more muscles. It also defines a number of Action Descriptors, which differ from AUs in that the authors of FACS have not specified the muscular basis for the action and have not distinguished specific behaviors as precisely as they have for the AUs.
For example, FACS can be used to distinguish two types of smiles as follows:
Insincere and voluntary Pan American smile: contraction of zygomatic major alone
Sincere and involuntary Duchenne smile: contraction of zygomatic major and inferior part of orbicularis oculi.
Although the labeling of expressions currently requires trained experts, researchers have had some success in using computers to automatically identify FACS codes, and thus quickly identify emotions. Computer graphical face models, such as CANDIDE or Artnatomy, allow expressions to be artificially posed by setting the desired action units.
The use of FACS has been proposed for use in the analysis of depression, and the measurement of pain in patients unable to express themselves verbally.
FACS is designed to be self-instructional. People can learn the technique from a number of sources including manuals and workshops, and obtain certification through testing. A variant of FACS has been developed to analyze facial expressions in chimpanzees.
P. Ekman and W. V. Friesen also developed EMFACS (Emotion Facial Action Coding System)  and FACSAID (Facial Action Coding System Affect Interpretation Dictionary)  which consider only emotion-related facial actions.
Codes for Action Units
See also: List of muscles in the human body#The muscles of the head
For clarification, FACS is an index of facial expressions, but does not actually provide any bio-mechanical information about the degree of muscle activation. Though muscle activation is not part of FACS, the main muscles involved in the facial expression have been added here for the benefit of the reader.
Action Units (AUs) are the fundamental actions of individual muscles or groups of muscles.
Action Descriptors (ADs) are unitary movements that may involve the actions of several muscle groups (e.g., a forward-thrusting movement of the jaw). The muscular basis for these actions hasn't been specified and specific behaviors haven't been distinguished as precisely as for the AUs.
For most accurate annotation, FACS suggests agreement from at least two independent certified FACS encoders.
 Intensity Scoring
Intensities of FACS are annotated by appending letters A-E (for minimal-maximial intensity) to the Action Unit number (e.g. AU 1A is the weakest trace of AU 1 and AU 1E is the maximum intensity possible for the individual person).
C Marked or Pronounced
D Severe or Extreme
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