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

[ヒトでの聴覚課題遂行中の事象関連電位および成績に対するGSM携帯電話電磁界の影響の検査] med./bio.

Examining the effects of electromagnetic fields emitted by GSM mobile phones on human event-related potentials and performance during an auditory task.

掲載誌: Clin Neurophysiol 2004; 115 (1): 171-178

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研究目的(著者による)

To explore the sensitivity of auditory event-related potentials to electromagnetic emissions.

詳細情報

The current study exposed subjects while they performed tasks, and employed a mobile phone with a substantial and consistent power output. In order to study alterations in sensory processing that may be produced by electromagnetic field exposure, the event-related potential parameters were assessed during an auditory oddball task.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 894.6 MHz
Modulation type: pulsed
ばく露時間: continuous for 1 h
  • 電力: 2 W peak
  • 電力: 250 mW mean
  • SAR: 0.87 W/kg unspecified (unspecified) (at the head)

ばく露1

主たる特性
周波数 894.6 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 1 h
Modulation
Modulation type pulsed
Pulse width 576 µs
Duty cycle 12.5 %
Repetition frequency 217 Hz
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 Participants were seated in a comfortable chair with an electro-cap fitted (comprising 62 tin electrodes). A mobile phone in a cradle was placed over the right temporal region in a normal use position. Audio circuits were disabled and a padding was placed between the handset and its casing to prevent any acoustic or thermal cues. The mobile phone was set via lap-top to a nominal mean power output of 250 mW.
Additional information There were two sessions one week apart, each with real or sham exposure for half of the participants in single-blind, counterbalanced, crossover conditions.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 250 mW mean - - -
SAR 0.87 W/kg unspecified 推定値 unspecified at the head

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 results suggest that mobile phone radiation may affect neural activity, particularly in proximity to the phone, however caution should be applied due to the small sample size. N100 amplitude decreased, N100 latency shortened and P300 latency was delayed during exposure compared to sham exposure. Effects were greatest over right hemisphere and midline sites (closest to the active mobile phone). Reaction time increased in the exposure relative to sham exposure condition and no difference in accuracy was found.

研究の種別:

研究助成

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