酗酒者认知脑电能量的头皮分布

为了理解酗酒对大脑功能的影响，已有研究多数是对被试者的脑电各节律特性分别进行分析,而缺乏分布特性研究.通过3种不同类型的实验,对酗酒者和正常对照组的脑电节律能量的头皮分布进行深入分析.结果表明,在3种不同认知任务下,酗酒者的α节律、δ节律和θ节律在枕区的能量都显著低于正常对照组;而酗酒者脑电β和γ节律在额区与颞区的能量显著高于正常对照组.不同的实验任务对各节律影响也不尽相同.α节律随着任务的不同,能量大小发生变化;枕区的θ节律、额区和颞区的δ节律能量分布在不同任务条件下也各不相同;而β能量则不受实验任务的影响.不同实验类型下酗酒者额区的脑电γ能量有所不同,而正常人却没有显著变化.因此慢波节律在不同区域能量的降低和快波节律在不同脑区能量的增加可能表明酒精长期作用会对大脑造成一定程度的损伤,进而影响大脑的认知过程,而且这种影响还通过皮层电活动头皮分布特性的不同得以体现.

Scalp Topographic Distribution Of Cognitive Electroencephalogram Power in the Alcoholic Subjects

To understand how alcohol interferes with brain function,previous researches were focused mostly on the analysis of characteristics of subjects' electroencephalogram (EEG) rhythms,while studies on their scalp distribution were insufficient.In this work,the scalp distribution of EEG power in alcoholic and normal controls using three experiment paradigms has been analyzed.The results show that,across all these experiments,alpha,delta and theta powers in the occipital region of alcoholics are significantly lower than those in normal subjects; while beta and gamma powers in the frontal and temporal region is much higher than the control group.Moreover,different experiment tasks had varied effects on the powers and on their distribution among all rhythms.Alpha power varied across the experiments,theta in the occipital region,and gamma power in frontal regions.However the paradigms had no effect on the distribution of beta power.It has been concluded that the decreased power of low frequency and the increased power of higher frequency imply the long-term abuse of ethanol,which would cause brain damage and deficiency in brain function.Such effects were revealed through different scalp distribution of brain's electrical activities.