ヒトの認知機能に対する連続波(CW)とパルス変調(PM)電磁界(EMF)の影響可能性が、健康な男性36人について研究された。彼らはCW、PM、擬似EMFへのばく露中に認知タスクを行った。彼らは各セッションで2回同じ作業を行い、一つでは左脳半球ばく露、もう一つでは右脳半球ばく露であった。EMF条件は、3つの実験セッションでひとまとまりとなるように配られ、各セッションは1週間の間が置かれた。ばく露される脳半球、EMF条件、テストの順番は全ての被験者で均衡をとった。二重盲検法を採用し、被験者と実験者の双方はEMF条件を知らなかった。EMFは信号発生器によって作り出され、それは増幅器を通してダミーの電話アンテナに接続され、その出力分布はオリジナルの市販携帯電話と同様になるようにした。EMFは0.25W(CW)の連続出力または平均0.25Wのパルス出力であった。機器が存在するだけで被験者の成績への影響があるかどうかを確認するため、追加の対照グループとして健康な男性16人がばく露機器のない状態で同じ作業を行った。異なるEMF条件の間、それぞれの脳半球ばく露の間、被験者グループと対照グループの間に影響は見いだされなかった。結論として、通常の携帯電話は、行動テストで測定された認知機能に明らかな影響を及ぼさないことを今回の結果は示した。
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To assess the effects of both continuous wave and pulsed wave electromagnetic fields on human cognitive function as measured by behavioral tests in 36 healthy male subjects. The subjects performed the same tasks twice during each session; once with left-sided and once with right-sided exposure.
The same cognitive tasks that were used in previous studies were employed (see publication 12332, publication 11186, publication 9851, publication 3601, and publication 4728).
ばく露 | パラメータ |
---|---|
ばく露1:
902 MHz
Modulation type:
CW
ばく露時間:
continuous for approx. 90 min
|
|
ばく露2:
902 MHz
Modulation type:
pulsed
ばく露時間:
continuous for approx. 90 min
|
Each subject participated in three sessions (CW, PM, and sham exposure), separated by 1 week. The tasks were performed twice during each session, once with left-sided and once with right-sided exposure. The exposed hemisphere, EMF condition, and test order were counterbalanced over all subjects, and a double-blind design was employed. An additional control group performed the same tasks without any exposure equipment.
周波数 | 902 MHz |
---|---|
タイプ |
|
ばく露時間 | continuous for approx. 90 min |
Modulation type | CW |
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ばく露の発生源/構造 |
|
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Distance between exposed object and exposure source | 20 mm |
チャンバの詳細 | The subjects were seated on a desk chair approx. 1 m from a computer screen. The signal generator and the power amplifier were located in an adjacent room. |
ばく露装置の詳細 | The dummy mobile phone was attached to the subject's head using an earmuff without metal parts, in which one of the protectors was replaced. The phone was positioned as in normal use. The antenna was located approx. 20 mm from the scalp over the posterior temporal lobe in the left-side exposure, and over the inferior and posterior temporal lobe in the right-side exposure. The difference between hemispheres was due to the asymmetrical position of the antenna. |
Sham exposure | A sham exposure was conducted. |
周波数 | 902 MHz |
---|---|
タイプ |
|
ばく露時間 | continuous for approx. 90 min |
Modulation type | pulsed |
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Pulse width | 0.577 ms |
Repetition frequency | 217 Hz |
ばく露の発生源/構造 |
|
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No effects were found between the different electromagnetic field conditions, separate hemisphere exposures, or between the control (n=16) and experimental exposed group. The data indicate that normal mobile phones have no discernible effect on human cognitive function.
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