この研究は、成獣オスのラット(n = 8)を対象に、弱レベル(0.1-0.2mW / cm)のマイクロ波(MW、945MHz、4Hzで振幅変調)ばく露時の、平均した脳電図周波数スペクトルを調べた。ラットは、無麻酔、非筋弛緩的状態であり、対称性領域に炭素電極を植え込まれた。断続的(1分 "オン"、1分 "オフ")のマイクロ波ばく露を10分間継続した。その結果、周波数スペクトル(10または1分間で平均)の大脳半球非対称性が見られ、左半球は1.5-3Hzでのパワー低下、右半球の10-14および20-30 Hzでのパワー低下という特徴が見られた;このようなデータ平均化においては、対照実験とばく露実験との間に差は見られなかった、などを報告している。
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To study dependence of the EEG frequency spectra of symmetrical areas of the rat brain on exposure duration of the weak microwave field amplitude modulated at extremely low frequency (ELF).
周波数 | 945 MHz |
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タイプ |
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ばく露時間 | intermittent, 1 min on/1 min off for 10 min |
Modulation type | AM |
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Modulation frequency | 4 Hz |
Additional information |
20 ms pulse width |
ばく露の発生源/構造 |
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Distance between exposed object and exposure source | 30 cm |
ばく露装置の詳細 | Animals kept in the plexiglas box ( 17 x 11 x 20 cm) which was kept in the anechoic chamber. |
Additional information | Rats with chronically implanted carbon electrodes in the symmetrical areas of the brain somesthetic cortex, a reference carbon electrode placed in the nasal bone. |
The hemispheric asymmetry in baseline EEG is identical in both the control and exposure experiments when the frequency spectra are averaged for 10-min period. The similarity between series is observed also in the successive 10-min periods. Thus, the irradiation does not cause any steady changes in the EEG asymmetry during the 10-min periods. A similar conclusion can be drawn from averaging the EEG frequency spectra for 1-min "field-on" and "field-off" periods. The influence of the microwave field on the EEG asymmetry was revealed when averaging of frequency spectra for 10-s periods was used. Compared to controls, the EEG hemispheric asymmetry in power of 10.5-14 Hz range increases significantly during the first 10-20 s after four from five onsets of the field. Under neither control nor pre- and postexposure conditions this effects was found. These data are discussed with respect to interaction of microwave fields with the EEG generators.
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