Table 1 EquiFACS action unit codes, descriptives, and exploratory GLMM results.

From: Domestic horses (Equus caballus) discriminate between negative and positive human nonverbal vocalisations

Action Unit Descriptor Emotion Mean SD F Exact Sig. (2-tailed)
AU101 time Inner brow raiser Positive 14.01 6.68 1.36 0.25
Negative 15.79 6.69   
AU145 count Blink Positive 4.18 2.60 2.79 0.10
Negative 3.14 2.85   
AU47 count Half blink Positive 3.57 2.12 0.10 0.76
Negative 3.36 3.21   
AU5 time Upper lid raiser Positive 3.37 5.46 0.44 0.51
Negative 4.29 6.47   
AD1 time Increased eye whites Positive 3.76 5.42 0.06 0.81
Negative 3.47 4.67   
AU113 count Sharp lip puller Positive 0.43 1.03 0.30 0.59
Negative 0.32 0.55   
AU16 count Lower lip depressor Positive 0.54 1.40 0.08 0.78
Negative 0.64 1.50   
AU17 count Chin raiser Positive 1.46 2.19 0.009 0.91
Negative 1.43 2.12   
AUH13 count Nostril lift Positive 0.79 1.10 1.41 0.24
Negative 1.14 1.51   
AD113 count Blow Positive 0.57 1.42 1.73 0.19
Negative 0.29 0.71