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

[短時間の携帯電話動作はヒトの神経機能に影響する] med./bio.

Acute mobile phone operation affects neural function in humans.

掲載誌: Clin Neurophysiol 2002; 113 (10): 1623-1632

この研究は、動作中の携帯電話(MP)へのばく露脳電図(EEG)に影響を与えるか否かを調べた。完全にバランスさせたクロスオーバー、単ブラインド法により、被験者24人で実験を行った。被験者全員について、MPオンまたはオフの2条件下で、安静時EEGと聴覚刺激に対する位相同期神経反応の両方を計測した。その結果、MPばく露時にEEGが変化し、1-4Hzの活動減少(右半球側)8-12Hzの活動増加(中央後部側)が見られた;MPばく露の初期に、位相同期神経反応が変化した、と報告している。

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研究目的(著者による)

To test whether exposure to an active mobile phone affects EEG as a function of time.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: continuous for 3 x 20 min

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 3 x 20 min
Modulation
Modulation type pulsed
Pulse width 0.577 ms
Repetition frequency 217 Hz
Additional information

Spoken extracts from a radio play (not audible to the subject) were played to the sending phone via a CD player at approximately 80 dB SPL (peak level).

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 5 cm
ばく露装置の詳細 The mobile phone was positioned 5 cm radial to the subject's scalp midway between Oz and Pz, using a non-metallic external bracket. The phone was removed and switched on or off outside of the recording room before the start of each condition. The purported EMF attenuator (Q Link Ally) was positioned over the subject's chest (left sternum) using a comfortable chest-strap and was operated from a separate room.
Additional information A 20 min series of tasks were performed 3 times, each with one of the 3 following (counterbalanced and single-blind) exposure conditions: exposure to an active mobile phone (MP) concurrent exposure to an active MP and a purported EMF attenuator both MP and EMF attenuator deactivated (control).
パラメータ
測定量 種別 Method Mass 備考
電力 4 mW mean 推定値 - 3-4 mW

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)

Exposure to an active mobile phone affects neural functions in humans, altering both resting EEG patterns and the evoked neural response to auditory stimuli, with a number of these changes occuring as a function of exposure duration.

研究の種別:

研究助成

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