Table 1.

Average difference in frequency of behaviors produced in each experimental condition

	Mother-reared	Human-reared	t-value	p
Eyes-closed vs. eyes-open
Manual gestures	−0.76	−1.57	−1.71	0.09
Other visible gestures	−0.43	−0.43	0.00	1.00
Vocalizations	1.62	1.38	−0.17	0.87
Attention getting behaviors	0.40	0.14	−0.22	0.83
Eyes-covered vs. mouth-covered
Manual gestures	−0.86	−1.52	−1.32	0.19
Other visible gestures	−0.22	−0.40	−0.65	0.52
Vocalizations	−1.31	0.78	2.43	0.02
Attention getting behaviors	−2.24	0.19	1.04	0.30

Negative values represent more behaviors being produced in the eyes visible condition than in the eyes invisible condition. A significant comparison is p<0.006, following Bonferroni adjustment for multiple comparisons