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EquiFACS: The Equine Facial Action Coding System

Fig 7

AU12, lip corner puller, without AU113, sharp lip puller, (A) and AU12 with AU113 (B).

Note the difference in the shape at the corner of the mouth. AU12 produces a curvature at the mouth corner; however, when AU113 is applied with AU12 the mouth has an angular appearance at the top corner, with corresponding wrinkles in the skin surrounding the mouth. See S15 Video for a demonstration of these actions acting simultaneously.

Fig 7

doi: https://doi.org/10.1371/journal.pone.0131738.g007