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.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
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)
