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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To assess the possible effects of electromagnetic field exposure on human brain electric oscillatory activity during an auditory memory task with words as stimuli.
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.
Modulation type: pulsed
ばく露時間: continuous for 30 min
|ばく露時間||continuous for 30 min|
|Pulse width||0.557 ms|
|Repetition frequency||217 Hz|
Pulse width is probably a misprint instead of 0.577 ms.
|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.|
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.