Research Article
Objectifying Facial Expressivity Assessment of Parkinson’s Patients: Preliminary Study
Table 2
FACS AUs and related muscles.
| | AU | FACS name | Facial muscle | Videotape | EMG |
| | AU1 | Inner brow raiser | Frontalis (pars medialis) | X | — | | AU2 | Outer brow raiser | Frontalis (pars lateralis) | X | — | | AU4 | Brow lowerer | Depressor glabellae, depressor supercilii, and CS | X | — | | AU6 | Cheek raiser | OO (pars orbitalis) | X | X | | AU7 | Lid tightener | OO (pars palpebralis) | X | X | | AU9 | Nose wrinkler | LLSAN | X | — | | AU10 | Upper lip raiser | LLS, caput infraorbitalis | — | X | | AU12 | Lip corner puller | Zygomaticus Major | X | — | | AU20 | Lip stretcher | Risorius | X | — | | AU23 | Lip tightener | Orbicularis Oris | X | — | | AU25 | Lips part | Depressor labii inferioris | X | — | | AU27 | Mouth stretch | Pterygoids, digastric | X | — | | AU45 | Blink | Contraction OO | — | X | | AU46 | Wink | OO | — | X |
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