Table 6.

Model 6’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	56.053	6.870	< .001
Image_size	Image_size			−0.002		2.731e−4		−0.002		−0.001	5939.445	−5.902	< .001
Image_brightness	Image_brightness			−0.008		1.479e−4		−0.008		−0.007	5937.553	−51.742	< .001
Image_pupil_size1	Linear			−0.015		0.004		−0.023		−0.008	5937.168	−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	2.827	0.005
Species2	Dog - human			0.187		0.018		0.152		0.222	5939.165	10.455	< .001
Image_pupil_size1 ✻ species1	Linear ✻ cat - human			−0.003		0.009		−0.022		0.015	5937.142	−0.342	0.732
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		0.010		−0.016		0.021	5937.189	0.253	0.800
Image_pupil_size2 ✻ species2	Quadratic ✻ dog - human			−0.008		0.010		−0.027		0.011	5937.414	−0.834	0.404
Random components		Groups	Name		SD	Variance	ICC
		Participant	(Intercept)		0.044	0.002	0.059
		Residual			0.173	0.030