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. Behavioral
scientists, CG animators, computer scientists interested in pattern
recognition programs, and other technicians and scientists use FACS in
their professional work when they need to know the exact movements
that the face can perform, and what muscles produce them. Working through the exercises of the FACS
Manual may also enable greater awareness of and sensitivity to subtle facial behaviors that could be useful for psychotherapists, interviewers, and other practitioners who must penetrate deeply into interpersonal communications.
