在单一模式和双模式刺激下gamma节律与ERP的同步效应  

Synchronization of the Activity of Gamma Oscillation and ERP Components

作　　者：王明时[1] 刘瑾[1] 诸强[2] 陈韵[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院生物医学工程与科学仪器系 [2]北方交通大学计算机与信息技术学院生物医学工程系

出　　处：《生物医学工程学杂志》2005年第5期884-889,共6页Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(30170308)

摘　　要：探讨视觉单一刺激、听觉单一刺激和视听双模式刺激的情况下,诱发脑电中的gamma节律的活动与刺激和ERP成分的同步效应.利用小波变换提取EEG诱发电位中的gamma节律成分,并用Gabor变换对其进行时频分析,结果发现gamma节律的活动不仅与外源性的刺激信号有关,而且与ERP的内源性成分(如N2b、P300)也具有明显的同步关系.同时,通过gamma节律在视听交叉模式下的活动规律也体现了人脑在多感觉模式下感觉的交叉与综合.根据在听力信号刺激后100～200 ms左右出现的gamma活动增强,认为gamma波活动可能与大脑对声音信号的感知有关.In the present study the activity of the gamma oscillation synchronized with the stimuli and ERP is investigated by means of unimodal and bimodal experiments, The multiresolution wavelet algorithm is used for signal extraction and Gabor transform is employed to represent the temporal evolution of the selected frequency components, The results show that the gamma oscillation is strongly phase-locked not only with the exogenous stimuli in the three experiments, but also with the endogenous components of ERPs （N2b,P300）, And the ERP and the gamma oscillation induced by the bimodal stimuli show the audio-vlsual bisensory integration and relationship. In addition, the results from the experiments with the auditory stimuli show that the gamma oscillation may be closely related to the perception of auditory signals.

关 键 词：gamma节律 双感觉模式 事件相关电位 P300 N2b GAMMA 同步效应 模式刺激 ERP 节律 内源性成分 GABOR变换 诱发电位 小波变换 

分 类 号：R318.04[医药卫生—生物医学工程]