Table 1 Equidae loadings. Loadings of the behaviors on the principal components with eigenvalue > 1 (PC1–PC4) extracted from the principal component analysis conducted on the Equidae responses (domestic and Przewalski’s horses combined). Behaviors with a loading ≥ r = l0.45l appear in bold
From: Cross-species discrimination of vocal expression of emotional valence by Equidae and Suidae
PC1 | PC2 | PC3 | PC4 | ||||
|---|---|---|---|---|---|---|---|
1st behavior | −0.27 | 1st behavior | 0.12 | 1st behavior | 0.31 | 1st behavior | −0.61 |
1st movement | 0.11 | 1st movement | 0.36 | 1st movement | −0.11 | 1st movement | −0.44 |
Looking at the loudspeaker | 0.75 | Looking at the loudspeaker | −0.32 | Looking at the loudspeaker | 0.06 | Looking at the loudspeaker | −0.09 |
Standing | −0.50 | Standing | −0.73 | Standing | −0.23 | Standing | −0.12 |
Walking | 0.53 | Walking | 0.74 | Walking | 0.14 | Walking | 0.05 |
Head movements | 0.48 | Head movements | 0.04 | Head movements | −0.38 | Head movements | −0.09 |
Head high | 0.76 | Head high | −0.25 | Head high | 0.19 | Head high | 0.21 |
Head in the middle | 0.08 | Head in the middle | 0.28 | Head in the middle | −0.75 | Head in the middle | −0.09 |
Ear movements | 0.35 | Ear movements | −0.30 | Ear movements | −0.25 | Ear movements | 0.27 |
Ear on the sides | −0.66 | Ear on the sides | 0.19 | Ear on the sides | −0.17 | Ear on the sides | 0.42 |
Ear forwards | 0.81 | Ear forwards | −0.24 | Ear forwards | 0.11 | Ear forwards | −0.27 |
Tail movements | −0.12 | Tail movements | 0.03 | Tail movements | −0.57 | Tail movements | −0.28 |
Tail low | −0.01 | Tail low | −0.37 | Tail low | −0.08 | Tail low | −0.25 |
Eating | −0.80 | Eating | −0.07 | Eating | 0.28 | Eating | −0.15 |
Eigenvalue | 1.97 | Eigenvalue | 1.34 | Eigenvalue | 1.20 | Eigenvalue | 1.07 |
Variance | 28% | Variance | 13% | Variance | 10% | Variance | 8% |