Table 3.

The mean amplitudes (over all four electrodes, in microvolts) and latencies (at the F3 electrode, in milliseconds) of the MMN and P3a in children with autism (A) and their controls (C)

Stimulus class	MMN		P3a		MMN		P3a
	Amplitude				Latency (SD)
	A	C	A	C	A	C	A	C
Vowels	−2.92*	−3.26†	−0.52 (ns)	3.52†	252 (34)	245 (30)	394 (43)	395 (33)
Complex tones	−5.15†	−5.05‡	2.66*	3.94†	184 (36)	187 (22)	342 (43)	323 (29)
Simple tones	−1.61 (ns)	−1.70*	2.08†	2.23‡	231 (45)	242 (37)	356 (34)	340 (41)

At the F3 electrode: 

^*, P < 0.05;  

^†, P < 0.01;  

^‡, P < 0.005; ns, nonsignificant.