不同脑功能状态下脑电三维动态频谱的变化

CHANGES OF THREE DIMENSIONAL DYNAMIC FREQUENCY SPECTRUM OF EEG IN DIFFERENT BRAIN FUNCTIONAL STATES

应用三维动枋频谱分析方法,对不同脑功能状态下的脑电活动作定理分析结果表明:在睁眼时α波(8—13Hz)的总面积仅为闭目安静时的无56.1°.其中以X_1成份(8—10Hz)下降显著.降至41.1°.X_2成份(11—13Hz)下降至71.0°心算时x节律抑制不明显β波段(17— 45Hz)在睁眼和心算时总面积无显著变化,但心算时β_1(17—31Hz)略占优势,而睁眼时β_2(31—45Hz)略呈优势。

The method of three dimensional dynamic frequency spectrum was applied to analyse the EEG quantitatively during different brain functional states. Results showed that the total area of α wave (8-13Hz) in eye-opened state was reduced to 56.1% of that in eye-closed state. There was a mark depression of x, component (8-10Hz) which was reduced to 41.1% during eye opening while the α2 component (11 -13Hz) was only reduced to 71.0%. The depression of a wave in the state of mental arithmetic task was not significant. Also the changes of the totel area of β wave in eye-opened state and state of mental arithemetic task were very little but the β1 component (17 -31 Hz) was dominant in the state of mental arithmetic task while the β2 component (31-45Hz) was prevalent in the eye-opened state.