この研究は、異なる電磁界（EMF）（900 MHzおよび1800 MHz）条件下での聴覚記憶タスク中の脳電図（EEG）への影響を調べた。タスクにおける刺激前の脳電図（EEG）信号について、スペクトルパワーコヒーレンス（SPC）を計算した。SPCは、脳の特定の場所における4つの基本的なEEGバンド（デルタ、シータ、アルファ、ベータ）のコヒーレントパターンを反映する。その結果、デルタリズムは、より周波数の高いシータ、アルファ、およびベータリズムに比べ、バンド間の全体的な協調における重要性が低いことが示された；さらに、SPCへの電磁界の影響は性別により異なることが示された；電磁界ばく露がない場合、男性は女性よりも高値の全体的SPCを示すが、これらの違いは、900 MHz存在下では消失し、1800 MHz存在下では元に戻った、と報告している。
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Previous investigations showed gender-related differences on the EEG during 900 MHz exposure (Papageorgiou et al. 2004) and during 1800 MHz exposure (Nanou et al. 2009).
In the present study (based on the previous data) spectral power coherence was calculated. Spectral power coherence is a measurement parameter that describes whether the EEG energy at a specific location of the brain is distributed among the different frequency bands (delta waves, theta waves, alpha waves, and beta waves) in a coordinated manner (i.e. whether subjects that have higher energy values in one frequency band should be anticipated to have higher energy values in the other frequency bands as well).
Two different groups took part in two separate experiments (900 MHz and 1800 MHz): group 1 consisted of 9 men and 10 women, group 2 consisted of 10 healthy men and 10 healthy women. The subjects performed the memory tests twice (exposed and sham-exposed) with an interval of two weeks.
|Sham exposure||A sham exposure was conducted.|
The results showed that the energy of the delta waves of the EEG did not vary between subjects in such a consistent manner as the energies of the other three EEG frequency bands.
Furthermore, the effect of exposure on the spectral power coherence of the three EEG frequency bands (theta waves, alpha waves, and beta waves) was different for the two genders. The spectral power coherence of males was the same at sham exposure and 900 MHz exposure, but showed a significant drop at 1800 MHz. At the same time females displayed a significant increase of the spectral power coherence at 900 MHz exposure compared to the sham exposure, however no further increase at 1800 MHz exposure.
In comparison of the genders males exhibited a significant higher consistency between the three EEG frequency bands than females at sham exposure, this difference between the genders disappeared at 900 MHz exposure. At 1800 MHz exposure females showed a significant higher consistency than males.
In conclusion, the data showed that the electromagnetic field exposure influenced the spectral power coherence of the EEG and this effect was gender dependend.