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. 2011 Aug 31;6(8):e24081. doi: 10.1371/journal.pone.0024081

Table 1. The 19 action units of the coding scheme and the definition of the cry-face and laughter-face gestalts based on this scheme indicated by tickmarks.

The 19 action units Cry – face gestalt Laughter face gestalt
1. Inner Brow Raise (AU1) <$>\raster="rg1"<$>
2. Outer Brow Raise (AU2)
3. Brow Lowerer (AU4) <$>\raster="rg1"<$> <$>\raster="rg1"<$>
4. Cheek Raiser (AU 6) <$>\raster="rg1"<$> <$>\raster="rg1"<$>
5. Nose Wrinkle(AU9) <$>\raster="rg1"<$> <$>\raster="rg1"<$>
6. Upper Lip Raiser (AU 10)
7. Nasolabial Crease (AU11) <$>\raster="rg1"<$> <$>\raster="rg1"<$>
8. Lip Pull (Au12) <$>\raster="rg1"<$>
9. Dimpler (AU14)
10. Lip Corner Depressor (AU15)
11. Lower Lip Depressor (AU 16) <$>\raster="rg1"<$>
12. Chin Raiser (AU17)
13. Lip Pucker (AU 18)
14. Tongue Show (AU19) <$>\raster="rg1"<$>
15. Lip Stretch (AU20)
16. Lip Presser (AU 24)
17. Lip parting (AU25) <$>\raster="rg1"<$> <$>\raster="rg1"<$>
18. Mouth Stretch (AU27) <$>\raster="rg1"<$> <$>\raster="rg1"<$>
19. Lip Suck (AU28).

Note: For both cry-face and laughter gestalts, either AU25 orAU27 can occur, but not both together.