FACS: Action Unit 6
Cheek Raise & Lid Compressor
& pars lateralis
AU6 is a key component of many facial correlates of emotion and pain.
FACS: Action Unit 12
Lip Corner Puller
AU12 is a key component of facial displays of happiness, amusement, contentment, and mirth.
FACS: Action Unit 25
The parting of the lips can occur for any number of muscular reason such as nose wrinkling, lip lifting or lowering, to pulling the jaw open.