Abstract: In the present study, 76 normal subjects (aged 6-12 years) were exam ined by ET. We focused on the speed of calculation and age related characteristics o f encephalofluctuograph. The results obtained were as follows: (1) In the group with fast performance of calculation test and the group with slow performance of calculation test, there were low power in the frontal area and high power in th e occiput area in the configuration of dominant power encephalofluctuograph in a ll age groups. The reverse percent in the group with slow performance was highe r than in the group with fast performance. (2) In all the groups of different ag e, the reverse percent in the group with fast performance was apparently lower t h an in the group with slow performance. The difference of the percent of the ante rior posterior reverse between the group with fast performance and the group wi t h slow performance was concentrated on the right brain hemisphere. (3) Both in t h e group with fast performance and in the group with slow performance, the power of the left hemisphere was fewer than that of the right hemisphere of dom inan t power in encephalofluctuograph between the two groups is concentrated on the p osterior area.

Key words: encephalofluctuograph, speed of calculation, chil dren