FACS action units (AU). AUs with “*” indicate that the criteria have changed for this AU, that is, AU 25, 26, and 27 are now coded according to criteria of intensity (25A-E), and AU 41, 42, and 43 are now coded according to criteria of intensity
Stu Dunn is the founder of the behavioural science consultancy, SDL. He is New Zealand's first and so far only Facial Action Coding System (FACS) Certified consultant. An expert in body language, micro expressions and emotional surveillance he has worked on analyzing police interview footage to assess credibility, written and consulted for a national publication and assisted with thesis and university studies.