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

[聴覚記憶タスク時のEEGに対する携帯電話放射電磁界効果:二重ブラインド法再現研究] med./bio.

Effects of electromagnetic field emitted by cellular phones on the EEG during an auditory memory task: a double blind replication study.

掲載誌: Bioelectromagnetics 2004; 25 (1): 33-40

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研究目的(著者による)

To replicate a previous study (publication 3600) and thus to assess whether the earlier findings on the effects of electromagnetic fields were replicable. The possible effects of electromagnetic field exposure on human brain electric oscillatory activity (ERD/ERS,- ERD/ERS is a pattern in the EEG signal, that shows functional alterations of neuronal networks) were examined utilizing the same memory task as used in the previous study.

詳細情報

EEG data analyses were conducted identically to the previous report and comprised of ERD/ERS analyses of the 4-6 Hz, 6-8 Hz, 8-10 Hz and 10-12 Hz 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
  • 電力: 0.25 W mean
  • SAR: 0.878 mW/g average over mass (1 g)
  • SAR: 0.648 mW/g average over mass (10 g)

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 0.577 ms
Repetition frequency 217 Hz
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 40 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 digital GSM phone was mounted to the subject's head over the left posterior temporal region positioned in direct contact to the left cheek in a normal use position. The antenna was located about 40 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 double-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 - - -
SAR 0.878 mW/g average over mass 測定値 1 g -
SAR 0.648 mW/g average over mass 測定値 10 g -

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 authors were not able to replicate the findings from the earlier study. All significant changes in the earlier study were not significant in the present double-blind study. Also, the effect of electromagnetic field radiation on the number of incorrect answers in the memory task was inconsistent. The authors previously reported no significant effect of electromagnetic field exposure on the number of incorrect answers in the memory task, but a significant increase in errors was observed in the present study. The only consistent finding between the present and the previous study was that in both studies electromagnetic fields decreased the magnitude or the ERS responses in the 4-6 Hz frequency band. The authors conclude that electromagnetic field effects on the EEG and on the performance on memory tasks may be variable and not easily replicable for unknown reasons.

研究の種別:

研究助成

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