Table 3.

Mean and SD of average amplitude and latency measures.

	Mother				Stranger
	TD		Sibs-ASD		TD		Sibs-ASD
	M	SD	M	SD	M	SD	M	SD
N290
Mean amplitude
Left temporal	1.83	7.53	−3.84	8.07	3.21	9.59	.10	6.94
Right temporal	−.79	8.14	−2.42	6.57	−1.51	9.44	.99	7.55
Latency
Left temporal	305.12	28.29	307.25	30.36	302.44	28.27	297.87	30.69
Right temporal	307.40	25.60	304.53	31.24	309.88	24.50	301.87	32.15
P400
Mean amplitude
Left temporal	5.28	7.81	−2.00	7.87	7.49	10.33	2.70	10.03
Right temporal	2.16	7.73	.04	6.66	2.42	9.90	2.88	8.49
Latency
Left temporal	405.44	24.94	414.24	33.34	420.64	19.23	404.80	35.89
Right temporal	407.96	26.74	397.07	32.69	423.24	20.92	399.20	29.70
Nc
Mean amplitude
Frontal midline	−.21	5.73	1.38	5.82	−.87	8.32	−2.95	6.86
Central midline	−2.68	7.26	.21	5.58	−3.12	6.03	−1.13	4.04
Latency
Frontal midline	482.37	54.79	503.69	60.408	477.73	43.66	486.22	61.78
Central midline	456.17	52.87	457.24	52.14	467.70	54.82	481.60	58.70