Table 1.

Mean area amplitude and peak latency measures of the difference waves with standard errors of the mean averaged over the three occipital electrodes Oz, O1 and O2.

Condition	Letter deviant amplitude	Latency	Non-letter deviant amplitude		Latency
VISUAL EXPERIMENT
Oz	−2.4 ± 0.2	260 ± 9	−3.3 ± 0.4		273 ± 7
001	−2.7 ± 0.3	260 ± 9	−3.4 ± 0.4		273 ± 6
002	−2,5 ± 0.3	259 ± 8	−3.3 ± 0.4		271 ± 6
				p < 0.001
AUDIOVISUAL EXPERIMENT
Oz	−2.2 ± 0.3	232 ± 8	−0.4 ± 0.5		268 ± 7
001	−2.7 ± 0.4	231 ± 7	−0.8 ± 0.5		270 ± 8
002	−2.6 ± 0.4	230 ± 8	−0.2 ± 10.6		267 ± 7