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

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