Table 5.

Means and standard deviations for visual Nc component amplitudes at midline sites for each age-group.

		4–5 years		6–7 years		8–9 years		10–12 years
		Amplitude		Amplitude		Amplitude		Amplitude
		Mean	SD	Mean	SD	Mean	SD	Mean	SD
Fz	Novel	−3.72	8.7	1.50	7.7	0.83	6.9	1.19	5.4
	Frequent	−11.01	8.6	−6.56	8.3	−9.75	7.7	−5.89	6.3
	Infrequent	−4.46	4.4	−0.39	5.4	−1.65	4.4	0.17	3.2
FCz	Novel	−2.25	6.3	2.90	7.7	1.73	6.2	2.85	5.3
	Frequent	−7.81	8.9	−3.44	7.8	−6.34	6.9	−3.09	6.4
	Infrequent	−2.80	4.7	0.55	5.3	−0.93	4.0	0.80	3.1
Cz	Novel	0.40	6.4	5.30	7.6	3.74	5.7	4.15	5.5
	Frequent	−5.56	10.0	−1.23	7.9	−2.47	6.8	−0.59	8.2
	Infrequent	−1.12	4.4	2.29	5.5	1.08	3.7	2.37	3.5
Pz	Novel	5.87	7.7	8.67	8.4	7.73	6.1	7.46	6.2
	Frequent	2.66	8.0	5.90	8.9	5.17	8.0	7.56	8.6
	Infrequent	3.84	5.0	5.73	5.8	4.73	4.3	5.60	4.4