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. 2020 Nov 3;15(11):e0231608. doi: 10.1371/journal.pone.0231608

Table 3. AUs found to be associated with pain using the Human FACS interpretation method for clinical data.

Clinical Data Pain AUs with HFI Method
Action Unit Half Blink
(AU47)
Inner Brow Raiser
(AU101)
Blink
(AU145)
Nostril Dilator
(AD38)
Ear Rotator
(EAD104)
Ears Forward
(EAD101)
Percentage of all Pain video AUs 10.89% 19.76% 17.34% 13.71% 10.89% 9.68%
More Frequent in Pain Videos
Percentage Difference 20.41% 15.38% 7.23% 6.06% -56.95%- -74.51%