この研究は、事象関連電位(ERP)の分析に基づき、GSM携帯電話機からの電磁界(EMF)がヒトの脳機能へ及ぼす影響を評価した。15人のボランティア(男性7、女性8)に、頭部に固定した受話器からEMFばく露し、同時にP300波を測定した。P300波の潜時、振幅、N1波、N2波、P2波の潜時を分析した。その結果、EMFばく露時のみP300の振幅が小さくなり、ばく露を中止すると振幅はばく露前の値に戻った;擬似ばく露では、そのような変化は観察されなかった; N1波、N2波、P2波の潜時、およびP300の潜時には統計学的に有意な変化は見られなかった、と報告している。
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To study the effect of electromagnetic fields from the GSM mobile phone system on human brain function.
15 subjects (7 men, 8 women) participated and each subject was investigated during exposure and sham exposure condition.
周波数 | 935 MHz |
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タイプ |
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ばく露時間 | continuous for 20 min. |
ばく露の発生源/構造 |
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チャンバの詳細 | darkened soundproof chamber |
ばく露装置の詳細 | mobile phone fixed with a plastic holder in a position typical for receiving phone calls and was connected to an external microprocessor; the call was simulated by directly wiring the phone to a tape-recorder which played a pre-recorded voice message |
Sham exposure | A sham exposure was conducted. |
The data did not reveal statistically significant changes in the latencies of N100, N200, P200 waves (that precede the P300 wave) nor in the latency of the P300 wave itself during and after the exposure to 935 MHz electromagnetic fields in relation to respective pre-exposure values. Also in the sham exposure measurement series, mean values of those waves did not differ from the original values.
On the other hand, the statistical analysis showed a statistically significant effect on P300 amplitude. Under real exposure conditions P300 amplitude was lower during the exposure (in comparison with sham exposure). Afterwards, the amplitude returned to the pre-exposure value.
The authors conclude that exposure to GSM electromagnetic fields exerts some effects on central nervous system, including its auditory evoked potentials
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