Lyskov E B, Juutilainen J, Jousmäki V, Partanen J, Medvedev S, Hänninen O
Institute of the Human Brain, Russian Academy of Science, St. Petersburg.
Bioelectromagnetics. 1993;14(2):87-95. doi: 10.1002/bem.2250140202.
The influence of sinusoidal 45-Hz magnetic fields on the brain functions of 20 volunteers was investigated in a double-blind study using spectral analysis of EEG and measurements of Omega potentials and reaction time (RT). The field strength was 1,000 A/m (1.26 mT) and the duration of exposure was 1 h. Ten volunteers were exposed to a continuous field and ten received an intermittent exposure (1 s on/l s off). Each person received one real and one sham exposure. One half of the volunteers got the real exposure first and the sham treatment after at least 24 h. For the rest, the sequence was inverse. The measurements of EEG, omega potentials and RT were performed before and after each exposure. Several statistically significant changes were observed, most of them after intermittent exposure. In the EEG, an increase of alpha (7.6-13.9 Hz) activity and a decrease of delta (1.5-3.9 Hz) activity were observed. Beta waves (14.2-20 Hz) increased in the frontal derivations as did the total power in occipital derivations. The mean and peak frequencies of EEG increased mainly in the frontal derivations. No direct effects on RT were seen. Learning to perform the RT test (decrease of RT in repeated trials), however, seemed to be affected by the exposure. The persons who received real exposure first learned more slowly than those who got sham exposure first. Further experiments are necessary to confirm the findings and for understanding the mechanisms of the effects.
在一项双盲研究中，通过脑电图（EEG）频谱分析、奥米伽电位测量和反应时间（RT）测量，研究了正弦45赫兹磁场对20名志愿者脑功能的影响。场强为1000 A/m（1.26 mT），暴露持续时间为1小时。10名志愿者接受连续磁场暴露，10名接受间歇暴露（开1秒/关1秒）。每个人都接受一次真实暴露和一次假暴露。一半志愿者先接受真实暴露，至少24小时后接受假治疗。其余志愿者顺序相反。每次暴露前后都进行EEG、奥米伽电位和RT测量。观察到了一些具有统计学意义的变化，其中大多数发生在间歇暴露之后。在EEG中，观察到阿尔法（7.6 - 13.9赫兹）活动增加，德尔塔（1.5 - 3.9赫兹）活动减少。额叶导联中的贝塔波（14.2 - 20赫兹）增加，枕叶导联中的总功率也增加。EEG的平均频率和峰值频率主要在额叶导联中增加。未观察到对RT有直接影响。然而，学习进行RT测试（重复试验中RT的降低）似乎受到暴露的影响。先接受真实暴露的人比先接受假暴露的人学习得更慢。需要进一步的实验来证实这些发现并理解其作用机制。
