Inner Brow Raiser
2Frontalis, pars medialis
Outer Brow Raiser
4Frontalis, pars lateralis
Brow Lowerer
5Corrugator supercilii, Depressor supercilii
Upper Lid Raiser
6Levator palpebrae superioris
Cheek Raiser
7Orbicularis oculi, pars orbitalis
Lid Tightener
9Orbicularis oculi, pars palpebralis
Nose Wrinkler
10Levator labii superioris alaquae nasi
Upper Lip Raiser
11Levator labii superioris
Nasolabial Deepener
12Zygomaticus minor
Lip Corner Puller
13Zygomaticus major
Cheek Puffer
14Levator anguli oris (a.k.a. Caninus)
Dimpler
15Buccinator
Lip Corner Depressor
16Depressor anguli oris (a.k.a. Triangularis)
Lower Lip Depressor
17Depressor labii inferioris
Chin Raiser
18Mentalis
Lip Puckerer
20Incisivii labii superioris and Incisivii labii inferioris
Lip stretcher
22Risorius w/ platysma
Lip Funneler
23Orbicularis oris
Lip Tightener
24Orbicularis oris
Lip Pressor
25Orbicularis oris
Lips part**
26Depressor labii inferioris or relaxation of Mentalis, or Orbicularis oris
Jaw Drop
27Masseter, relaxed Temporalis and internal Pterygoid
Mouth Stretch
28Pterygoids, Digastric
Lip Suck
41Orbicularis oris
Lid droop**
42Relaxation of Levator palpebrae superioris
Slit
43Orbicularis oculi
Eyes Closed
44Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis
Squint
45Orbicularis oculi, pars palpebralis
Blink
46Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis
Wink
51Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis
Head turn left
52
Head turn right
53
Head up
54
Head down
55
Head tilt left
56
Head tilt right
57
Head forward
58
Head back
61
Eyes turn left
62
Eyes turn right
63
Eyes up
64
Eyes down
* AUs (Action Units) underlined bold are currently recognizable by AFA System when occurring alone or cooccurring.
** The criteria has changed for this AU, that is, AU 25, 26 and 27 are now coded according to criteria of intensity (25A-E) and also AU 41, 42 and 43 are now coded according to criteria of intensity
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