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Overview of recorded action units (AUs).
| AU | Description |
|---|---|
| 1 | Inner brow raiser |
| 2 | Outer brow raiser |
| 4 | Brow lowerer |
| 5 | Upper lid raiser |
| 6 | Cheek raiser |
| 7 | Lid tightener |
| 9 | Nose wrinkler |
| 10 | Upper lip raiser |
| 12 | Lip corner puller |
| 14 | Dimpler |
| 15 | Lip corner depressor |
| 17 | Chin raiser |
| 18 | Lip puckerer |
| 20 | Lip stretcher |
| 23 | Lip tightener |
| 24 | Lip pressor |
| 25 | Lips part |
| 28 | Lip suck |
The list and the descriptions of the AUs have been taken from the website of Imotions (Farnsworth, 2016).
