摘要
通过时-频法研究5 Hz频率光刺激前、光刺激中平均脑电信号θ波能量百分比的差异性。研究发现光刺激中能量百分比在前额(F8)、顶部(P4)、中央(C3)、颞区(T6)和枕部(O2)均有显著性增加。在枕部(O2)区域光诱发最初20 s内α波能量百分比从45%下降到30%,θ波能量百分比从25%上升到35%,θ波能量百分比呈上升趋势;中间20 s内,θ波能量百分比呈下降趋势,最后20 s,θ波能量百分比恢复到基线。以上结果说明在20～30 s,5 Hz频率光刺激能够驱动脑电信号从优势脑波α波转向以θ波为主。对研究低频率光诱发响应,应用时-频脑电波能量百分比方法是一条新的途径。
The main difference of the percentages of energy of EEG θ wave before and during 5 Hz photic stimulation is studied by utilizing time-frequency methods.The results show that the percentages of energy increase more visible on the forehead（F8）,top（P4）,central（C3）,temporal（T6）,and occipital（O2）.Within the first 20 s of photic stimulation,the percentage of regional α wave energy decreases from 45% of total energy to 30%,the percentage of θ wave energy increases from the total energy of 25% to 35%,and keeps upward trend.In the middle 20 s,the percentage of θ wave energy decreases.In the last 20 s,the percentage of θ wave energy goes back to baseline level.These results suggest that 5 Hz photic stimulation within 20—30 s can drive EEG from dominant α brain waves to θ waves.The percentage of brain wave energy is a new approach to response induced by low-frequency photic stimulation.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2011年第6期805-809,共5页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(61075107)资助项目
江苏省普通高校研究生科研创新计划(CX10B-096Z)资助项目
关键词
光刺激
事件相关电位
小波变换
θ波
时-频分析
photic stimulation
event-related potentials
wavelet transform
θ wave
time-frequency analysis
