. Author manuscript; available in PMC: 2020 Jul 1.

Published in final edited form as: Psychol Sci Public Interest. 2019 Jul;20(1):1–68. doi: 10.1177/1529100619832930

Table 3:

The Facial Action Coding System (FACS; Ekman & Friesen, 1978) codes for adults

AU	Description	Facial muscles (type of activation)
1	Inner brow raiser	Frontalis (pars medialis)
2	Outer brow raiser	Frontalis (pars lateralis)
4	Brow lowerer	Corrugator supercilii, depressor supercilii
5	Upper lid raiser	Levator palpebrae superioris
6	Cheek raiser	Orbicularis oculi (pars orbitalis)
7	Lid tightener	Orbicularis oculi (pars palpebralis)
9	Nose wrinkle	Levator labii superioris alaquae nasi
10	Upper lip raiser	Levator labii superioris
11	Nasolabial deepener	Zygomaticus minor
12	Lip corner puller	Zygomaticus major
13	Cheeks puffer	Levator anguli oris
14	Dimpler	Buccinator
15	Lip corner depressor	Depressor anguli oris
16	Lower lip depressor	Depressor labii inferioris
17	Chin raiser	Mentalis
18	Lip puckerer	Incisivii labii superioris and incisivii labii inferioris
20	Lip stretcher	Risorius w/ platysma
22	Lip funneler	Orbicularis oris
23	Lip tightener	Orbicularis oris
24	Lip pressor	Orbicularis oris
25	Lips part	Depressor labii inferioris or relaxation of mentalis, or orbicularis oris
26	Jaw drop	Masseter, relaxed temporalis and internal terygoid
27	Mouth stretch	Pterygoids, digastric
28	Lip suck	Orbicularis oris
41	Lid Droop
42	Slit
43	Eyes Closed
44	Squint
45	Blink
46	Wink