Table 2.

Main Results of the Binomial regression.

Binomial regression	Positive anticipation compared to frustration non-social			Frustration social compared to frustration non-social
Behavioural Variables	Estimate	Z	p value	Estimate	Z	p value
Ears forward (EAD101)	0.822 ± 0.269	3.074	0.002	0.557 ± 0.259	2.153	0.003
Ears adductor (EAD102)	− 0.040 ± 0.199	− 0.199	0.842	− 0.440 ± 0.201	− 2.188	0.029
Ears rotator (EAD104)	− 0.321 ± 0.202	− 1.590	0.112	− 0.257 ± 0.201	− 1.279	0.201
Ears downward (EAD105)	0.370 ± 0.264	1.405	0.160	0.559 ± 0.261	2.142	0.032
Ears flattener (EAD103)	− 0.016 ± 0.542	− 0.003	0.976	1.267 ± 0.478	2.651	0.008
Inner Brow Raiser (AU101)	0.132 ± 0.205	0.642	0.521	− 0.148 ± 0.204	− 0.726	0.468
Blink (AU145)	− 0.380 ± 0.200	− 1.893	0.058	0.492 ± 0.196	2.510	0.012
Showing the sclera	0.106 ± 0.206	0.515	0.607	0.064 ± 0.206	0.309	0.757
Nose lick (AD137)	0.097 ± 0.313	0.310	0.757	0.603 ± 0.289	2.082	0.037
Looking away	− 0.764 ± 0.198	− 3.850	0.000	− 0.147 ± 0.191	− 0.769	0.442
Tail wagging	0.485 ± 0.318	1.525	0.127	2.051 ± 0.334	6.134	0.000
Whining	− 0.679 ± 0.451	− 1.507	0.132	1.020 ± 0.361	2.823	0.005
Sniffing the environment	− 0.762 ± 0.408	− 1.057	0.062	− 0.659 ± 0.397	− 1.057	0.097
Pushing the apparatus	1.566 ± 0.312	5.017	0.000	0.180 ± 0.329	0.546	0.585