研究のタイプ: 医学/生物学の研究 (experimental study)

[視覚作業記憶タスク時のEEGに対する携帯電話磁界の影響] med./bio.

Effects of electromagnetic fields emitted by cellular phones on the electroencephalogram during a visual working memory task.

掲載誌: Int J Radiat Biol 2000; 76 (12): 1659-1667

この研究は、ボランティアの被験者(n = 24)を用い、認知タスク遂行中のEEG周波数帯(4-6、6-8、8-10および10-12Hz)の事象関連脱同期同期(ERD / ERS)応答に対する携帯電話からの電磁界EMF:902 MHz)の影響を調べた。各被験者は、視覚的文字呈示タスク(nバックタスク:作業記憶負荷は3通り(0、1、2バック))を、EMFばく露有り・無しの2つの条件下で遂行した。ばく露有り・無し実験の順番は、被験者全体でカウンターバランスをとった。その結果、EMFばく露下では、6-8と8-10 Hzの周波数帯でERD / ERS応答が変化した;それは、記憶負荷の関数としての変化のみであり、また、提示された刺激が、あるターゲットであるか否かに依存した、と報告している。

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研究目的(著者による)

To assess the possible effects of electromagnetic field exposure by mobile phones on the event related desynchronisation/synchronisation (ERD/ERS) responses of the 4-6, 6-8, 8-10 and 10-12 Hz EEG frequency bands during cognitive processing.

詳細情報

ERD/ERS is a pattern in the EEG signal, that shows functional alterations of neuronal networks. EEG frequencies are subdivided into frequency bands. The simultaneously recorded responses of different EEG frequency bands differ from each other and reflect different cognitive and/or mental processes.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902 MHz
Modulation type: pulsed
ばく露時間: continuous for about 30 min

ばく露1

主たる特性
周波数 902 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 30 min
Modulation
Modulation type pulsed
Pulse width 0.557 ms
Repetition frequency 217 Hz
Additional information

One time slot was used. Pulse width is probably a misprint instead of 0.577 ms.

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • at maximum power
Distance between exposed object and exposure source 20 mm
チャンバの詳細 The subject was seated in a comfortable chair in the registration room and was instructed to look at a TV screen placed 1.5 m in front of him/her and to avoid unnecessary eye movements.
ばく露装置の詳細 A standard GSM phone was mounted to the subject's head over the right posterior temporal region in a normal use position. The antenna was located about 20 mm from the skin. The phone was operated via a computer from an adjacent room.
Additional information Each EEG test session was subdivided into two segments, with or without EMF in single-blind, counterbalanced order. The total testing time was about 60 min.
パラメータ
測定量 種別 Method Mass 備考
電力 0.25 W mean - - -

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
調査の時期:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

The presence of electromagnetic fields altered the ERD/ERS responses in the 6-8 and 8-10 Hz frequency bands during mental processes requiring attention. The data do not, however, allow any conclusions concerning the possible effects of mobile phone use on cognition.

研究の種別:

研究助成

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