Table 2.

Means (M) and standard deviations (SD) for the proportion of time looking to the novel face, out of the total time looking to both novel and familiar faces, in test trials. Cumulative looking at three time points is shown: first 1 second, first 2 seconds, and first 3 seconds.

Subjects	Face Stimulus		Proportion of Time Looking to Novel
			0–1 seconds			0–2 seconds			0–3 seconds
	Species	Age	M	SD	p	M	SD	p	M	SD	p
Newborns	Human	Adult	0.56	0.25	0.202	0.53	0.19	0.440	0.50	0.20	0.928
		Old Infant	0.46	0.23	0.435	0.47	0.18	0.443	0.49	0.17	0.716
		Young Infant	0.55	0.28	0.357	0.53	0.20	0.522	0.54	0.17	0.264
	Monkey	Adult	0.59	0.24	0.087	0.57	0.23	0.123	0.54	0.21	0.343
		Old Infant	0.50	0.27	0.985	0.54	0.21	0.406	0.56	0.15	0.081
		Young Infant	0.47	0.25	0.536	0.46	0.23	0.380	0.47	0.17	0.375
6- to 7-month-olds	Human	Adult	0.63	0.20	< 0.001*	0.61	0.18	0.001*	0.55	0.15	0.055
		Old Infant	0.57	0.22	0.079	0.58	0.18	0.016	0.60	0.20	0.011
		Young Infant	0.50	0.23	0.979	0.56	0.18	0.085	0.54	0.17	0.177
	Monkey	Adult	0.58	0.22	0.054	0.61	0.20	0.003*	0.61	0.20	0.005
		Old Infant	0.55	0.19	0.112	0.60	0.14	< 0.001*	0.58	0.16	0.006
		Young Infant	0.52	0.17	0.531	0.55	0.18	0.144	0.56	0.21	0.152

Significant differences with Bonferroni corrections indicated by:

^*ps ≤ .003, one-sample t tests (chance .50).