毫米波辐照下大鼠脑电的长程相关性

摘要

通过脑电长程相关性的分析,定量研究了35 GHz毫米波辐照大鼠时产生的应激反应.通过退趋势分析法,得到反映高频成分的标度指数.显示在辐照前该成分具有布朗噪声的特性,辐照时具有长程相关性;而反映低频成分的标度指数显示在辐照前该成分具有长程相关性,辐照时成为布朗噪声.引进应激指标参量低频成份标度指标数/高频成份标度指标数,用其值的平均变化率来衡量大鼠在35 GHz毫米波作用下应激反应的剧烈程度.通过计算得到辐照时应激指标参量增加了49.9%±13.6%,说明35 GHz毫米波辐照使得大鼠脑电的高频部分变得更加有序,而低频成分变得更加无序,表明大鼠受35 GHz毫米波辐照而产生了剧烈应激反应.%A quantitative study was conducted on stress reaction in rat induced by 35 GHz millimeter wave.Long-range correlations analysis of the rat electroencephalogram(EEG) was investigated.The scaling exponents α1 and α2 were calculated by detrended fluctuation analysis(DFA) method.The exponent α1 shows that the high frequency EEG component is characterized by Brownian noise before irradiated by 35 GHz millimeter wave while it has long-range correlations during irradiation.The exponent α2 shows that the low frequency EEG component has long-range correlations before irradiation while it is characterized by Brownian noise during irradiation.Introducing stress parameter k(k=α2/α1 ), the average change rate of k was used to evaluate the intensity of stress in rat evoked by 35 GHz millimeter wave.The k increases 49.9％ ±13.6％ during irradiation, which indicates that the high frequency EEG component becomes more ordered and the low frequency EEG component becomes more disordered,showing the acute stress irt rat induced by 35 GHz millimeter wave.