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N550 amplitude presented as a proportion of the amplitude at Fz. Data are presented from the present study, from the seven 19 to 28-year-old male subjects reported in Webster and Colrain4 and five 23 to 29-year-old female control subjects drawn from Afifi et al.5 The data from the children in the present study demonstrate the lack of the typical adult pattern of an anterior-posterior gradient in N550 amplitude.
