中文摘要：

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。

英文摘要：

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.