Table 2.

Results from mixed effects regression analyses comparing differences in free-play behavior related to recognition accuracy.

	Free-play behavior	Predictor	B	se	t	95% CI	Variance	SD	X2	p	d
Solid objects	Coordinated exploration	Recognized vs. Not Recognized	−0.47	2.19	−0.21	−4.65, 3.72	–	–	0.05	0.822	0.07
		Age	0.13	0.22	0.57	−0.30, 0.55	–	–	0.36	0.551	0.25
		Vocabulary	−0.007	0.009	−0.77	−0.02, 0.01	–	–	0.65	0.422
		Subject intercept	–	–	–	–	<0.0001	<0.0001	<0.0001	>0.99	0.18
	Synchronous naming rate	Recognized vs. Not Recognized	0.18	0.08	2.20	0.02, 0.34	–	–	4.94	0.026*	0.80
		Age	−0.02	0.01	−1.77	−0.05, 0.001	–	–	3.53	0.060	0.79
		Vocabulary	0.0007	0.0005	1.38	−0.0003, 0.002	–	–	2.25	0.134	0.99
		Subject Intercept	–	–	–	–	0.04	0.19	6.27	0.012	–
Nonsolid substances	Coordinated exploration	Recognized vs. Not Recognized	1.71	1.45	1.18	−1.05, 4.48	–	–	1.53	0.217	0.41
		Age	0.06	0.14	0.45	−0.20, 0.32	–	–	0.24	0.627	0.27
		Vocabulary	−0.004	0.007	−0.68	−0.02, 0.008	–	–	0.51	0.475	0.34
		Subject Intercept	–	–	–	–	0.34	0.59	0.0001	0.992	–
	Synchronous naming rate	Recognized vs. Not Recognized	−0.06	0.07	−0.78	−0.19, 0.08	–	–	0.64	0.424	0.28
		Age	0.0005	0.009	0.06	−0.02, 0.02	–	–	0.003	0.956	0.03
		Vocabulary	0.0003	0.0004	0.83	−0.0004, 0.001	–	–	0.87	0.350	0.43
		Subject Intercept	–	–	–	–	0.01	0.11	1.59	0.207	–

* indicates a significant effect.