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

[記憶タスク時のEEGに対する携帯電話電磁界の影響] med./bio.

Effects of electromagnetic field emitted by cellular phones on the EEG during a memory task

著者: Krause CM, Sillanmaki L, Koivisto M, Haggqvist A, Saarela C, Revonsuo A, Laine M, Hämäläinen H
掲載誌: NeuroReport 2000; 11 (4): 761-764
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この研究は、携帯電話から放射される電磁界（EMF）が、聴覚記憶タスクを遂行中の健常な被験者（n =16）における4〜6 Hz、6〜8 Hz、8〜10 Hz、および10〜12 Hzの脳電図（EEG）周波数バンドでのERD / ERSに与える影響を調べた。すべての被験者は、カウンターバランスした順番で、デジタル９０２ＭＨｚのＥＭＦばく露のあり、なしのそれぞれの条件下で記憶タスクを遂行した。その結果、EMFばく露下では、8〜10 Hzの周波数バンドのみで有意なEEGパワー増加が見られた；それにもかかわらず、EMFばく露下では、時間と記憶タスクの関数で、全ての周波数バンドにおけるERD / ERS応答が変化した；ＥＭＦばく露は安静時ＥＥＧそれ自体を変化させるのではなく、記憶タスク遂行中の脳応答を有意に変化させる可能性が示されたと報告している。

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研究目的（著者による）

To assess the possible effects of electromagnetic field exposure on human brain electric oscillatory activity during an auditory memory task with words as stimuli.

詳細情報

The authors focused on event related desynchronisation (ERD) and synchronisation (ERS) (ERD/ERS is a pattern in the EEG signal, that shows functional alterations of neuronal networks) of the 4-6 Hz, 6-8 Hz, 8-10 Hz and 10-12 Hz narrow EEG frequency bands. 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 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 30 min
Modulation
Modulation type pulsed
Pulse width 0.557 ms
Repetition frequency 217 Hz
Additional information

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
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 a dimmed 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 head. 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 値 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:
  • ばく露中

研究の主なアウトカム（著者による）

The radiation to electromagnetic fields significantly increased EEG power in the 8-10 Hz frequency band only. Nonetheless, the presence of electromagnetic fields altered the ERD/ERS responses in all studied frequency bands as a function of time and memory task. The results suggest that the radiation to electromagnetic fields does not alter the resting EEG per se but modifies the brain responses during a memory task.

研究の種別:

研究助成

Replication studies

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