The characteristics of EEG change showed numerous or single slow spikes of high amplitude on the centrotemporal area under the background of the normal activity of the children.

• 脑电图背景活动正常,中央-中颞区出现成串或单一的高波幅的棘波,可局限于一侧半球,也可从一侧半球转移至对侧半球。