Table 7.

Model 21’s fixed effect parameter estimates and random effect variance and correlation values

Fixed effects parameter estimates				95% Confidence interval
Names	Effect	Estimate	SE	Lower	Upper	df	t	P
(Intercept)	(Intercept)	0.043	0.006	0.031	0.055	56.054	6.870	< .001
Image_size	Image_size	−0.002	2.729e−4	−0.002	−0.001	5939.432	−5.917	< .001
Image_brightness	Image_brightness	−0.008	1.478e−4	−0.008	−0.007	5937.550	−51.787	< .001
Image_pupil_size1	Linear	−0.015	0.004	−0.023	−0.008	5937.169	−3.955	< .001
Image_pupil_size2	Quadratic	0.002	0.004	−0.006	0.009	5937.167	0.479	0.632
Species1	Cat - human	0.016	0.005	0.005	0.026	5937.876	2.829	0.005
Species2	Dog - human	0.187	0.018	0.152	0.222	5939.155	10.472	< .001
Dog_person/attitude	Dog_person/attitude	8.744e−4	0.006	−0.011	0.013	55.995	0.140	0.889
Image_pupil_size1 ✻ species1	Linear ✻ cat - human	−0.003	0.009	−0.022	0.015	5937.142	−0.342	0.733
Image_pupil_size2 ✻ species1	Quadratic ✻ cat - human	−0.007	0.010	−0.026	0.012	5937.293	−0.722	0.470
Image_pupil_size1 ✻ species2	Linear ✻ dog - human	0.002	0.009	−0.016	0.021	5937.188	0.255	0.799
Image_pupil_size2 ✻ species2	Quadratic ✻ dog - human	−0.008	0.010	−0.027	0.011	5937.414	−0.837	0.403
Species1 ✻ dog_person/attitude	Cat - human ✻ dog_person/attitude	−0.003	0.005	−0.014	0.008	5937.462	−0.536	0.592
Species2 ✻ dog_person/attitude	Dog - human ✻ dog_person/attitude	−0.015	0.005	−0.026	−0.004	5937.510	−2.766	0.006
Random components	Groups	Name	SD	Variance	ICC
	Participant	(Intercept)	0.044	0.002	0.059
	Residual		0.173	0.030