Abstract
Patterns of MVEP (mean visual evoked potential) and the latency time of Peaks II, III, IV, V and VI of the MVEP were studied on 200 children under the age of 3 years. They consisted of 150 healthy children and 50 children with any history suggesting of central nervous system disorders.
Patterns of the MVEP were divided into 3 groups according to the polarity of Peak V and the form of the evoked potential waves: group A consisted of cases with the Peak V of the same polarity as that described by Gastaut, group B included cases with the Peak V of the reversed polarity; and group C included cases with wave forms which were not classified into group A or B.
In the MVEP patterns of the 150 healthy children under 3 years of age, it was found that the patterns of groups A and B were observed in approximately equal number, and that the patterns of group B showed a tendency to increase in incidence with advance in age.
In the MVEP patterns of the 50 children with a history suggestive of central nervous system disorders, an incidence of the MVEP patterns of group C was found to be significantly higher.
The mean values of the peak latency time showed a tendency to decrease with advance in age. However, they were not suitable for a method of evaluation of the brain maturation because of large range of variation in the latency time at each of the evoked potentials.
