通过时-频法研究5 Hz频率先刺激前、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20～30s,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 0 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 (02). Within the first 20 s of photic stimulation, the percentage of regional a wave energy decreases from 45% of total energy to 30%, the percentage of 6 wave energy increases from the total energy of 25% to 35%, and keeps upward trend. In the middle 20 s, the percentage of 0 wave energy decreases. In the last 20 s, the percentage of 6 wave energy goes back to baseline level. These results suggest that 5 Hz photic stimulation within 20-30 s can drive EEG from dominant a brain waves to 9 waves. The percentage of brain wave energy is a new approach to response induced by low-frequency photic stimulation.
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