截取不同时间数据段对脑电地形图结果的影响

EFFECT ON BRAIN ELECTRICAL ACTIVITY MAPPING BY TAKING DIFFERENT EEG EPOCHS

本文分析了14组不同时间长度的数据段,从脑电背景和突发(异常)脑电活动两个方面观察其对BEAM结果的影响。结果显示,不同时间数据段对脑电图背景分析的结果无显著影响(P>0.05)。不同异常成分含量的数据段随其含量的多寡结果各异。异常成分含量大于25％的数据段对BEAM结果影响显著(P<0.01)。本文提出:1.脑电背景分析,可截取不少于30秒数据段分析。2.突发(异常)脑电活动分析,截取的数据段必须含有25％以上的异常成分。3.对背景活动和突发(异常)成分分别进行分析,有利于获得两者各自的特征,结果更准确。

14 groups of different EEG epochs have been analysed through observing their effects on BEAM from both of the brain electrical background and the breaking out (abor-mal) brain electrical activity. The result shows that different EEG epochs have no apparent effects on the result from the analysis of EEG background. However, the amount of abnormal content of EEG epochs can lead to a change in the result of BEAM. When the amount of abormal content is more than 25 per cent, these epochs will greatly effect the result of BEAM (P< 0. 01) .The article thus suggests: 1. It is desirable to take 30 seconds of epochs for analysis in EEG background. 2. The abnormal rate in the taken EEG epochs for analyzing the breaking out (abnormal) brain electrical activity must be more than 25 per cent. 3. Making separate analysis of the brain electrical brackground and the breaking out (abnormal) brain electrical activity will be beneficial to get their respective characters with a more accurate result.