Table 3.

Cortical response measures

	Quiet		Noise
	TD mean (SD)	ASD mean (SD)	TD mean (SD)	ASD mean (SD)
P1′ latency (ms)*	140.14 (20.625)	159.69 (22.809)	151.91 (14.193)	169.91 (20.571)
N1′ latency (ms)	235.41 (21.432)	244.91 (30.480)	236.41 (26.693)	247.41 (32.117)
Peak-to-trough duration (ms)	95.27 (22.202)	85.22 (19.211)	84.50 (23.671)	77.50 (29.051)
Peak-to-trough amplitude (mV)*	6.56 (1.894)	4.66 (1.899)	5.22 (2.109)	4.13 (1.961)
Slope (μV/ms)	−0.07 (0.030)	−0.05 (0.020)	−0.07 (0.031)	−0.05 (0.019)
Signal-to-noise ratio RMS	9.13 (4.574)	10.67 (2.504)	8.97 (6.147)	8.23 (3.376)
Quiet-to-noise correlation (r-value)	–	–	0.82 (0.467)	0.54 (0.690)

Mean (SD) of cortical response measures in quiet and background noise conditions are reported for both TD children (n = 11) and children with ASD (n = 16). Responses of children with ASD demonstrated significantly prolonged P1′ latencies in quiet and background noise, as well as reduced peak-to-trough amplitudes in quiet compared to responses of TD children (* p ≤ 0.017)