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

[携帯電話放射下でのEEG信号のフラクタル次元解析] med./bio.

Analysis of fractal dimension of EEG signals under mobile phone radiation.

掲載誌: IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), 2015. IEEE, 2015, ISBN 9781479918218: 1-5

脳電図(EEG)は非線形、非定常的で雑音の多い信号なので、非線形の分析方法が適している。この研究は、携帯電話使用時のEEGへの影響を、21個の電極についてのデータセットのフラクタル次元(FD)を用いて分析した。その結果、EEG信号の異なるクラス、主にデルタ、シータ、アルファ、ベータおよびガンマのFDについて分析したところ、ガンマ帯の3個の電極で有意であった。著者らは、全体として、携帯電話使用時のEEGの複雑さに対する影響はなかった、と結論付けている。

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研究目的(著者による)

The effects of exposure of subjects to the electromagnetic field of mobile phones on the brain activity should be investigated.

詳細情報

The EEG of 35 healthy subjects was recorded during 5 consecutive trials of 5 minutes with different exposure conditions, respectively: 1) resting EEG without exposure, 2) mobile phone 1 placed at right ear, 3) mobile phone 1 placed at vertex (Cz position), 4) mobile phone 2 placed at right ear and 5) mobile phone 2 placed at vertex. Trial 1 was used as the control condition, trials 2-5 were the exposure conditions.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1:
ばく露時間: continuous for 5 minutes/position/phone (20 minutes in total)
-

ばく露1

主たる特性
周波数
タイプ
  • electromagnetic field
ばく露時間 continuous for 5 minutes/position/phone (20 minutes in total)
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
ばく露装置の詳細 two different phones (remark EMF-Portal: no further information given) were used for exposure at two different skull positions (right ear and vertex); during the procedure, the volunteers were instructed to lie down and relax and the phones were switched on during exposure (in talking mode); the volunteers were unaware of the instant of switching the mobile phones
パラメータ

No parameters are specified for this exposure.

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

研究の主なアウトカム(著者による)

Significant changes in the total EEG during the exposure conditions compared to the control condition were found at two electrodes only. Regarding the individual brain waves, three electrodes showed significant changes solely in the gamma wave band during the exposure conditions compared to the control condition.
(Remark EMF-Portal: the different mobile phones and exposure positions were not analyzed individually.)
The authors conclude that exposure of subjects to the electromagnetic field of mobile phones has no effect on the brain activity.

研究の種別:

研究助成

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