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

[聴覚誘発反応に対するGSM信号の影響] med./bio.

Effects of GSM signals on auditory evoked responses.

掲載誌: Bioelectromagnetics 2005; 26 (5): 341-350

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研究目的(著者による)

To investigate the influence of radiofrequency fields emitted by GSM (Global System for Mobile Communications) phones on the human cerebral activity. The auditory evoked potentials (AEPs) of healthy humans and epileptic patients were analyzed.

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
  • SAR: 1.4 W/kg average over mass (10 g) (maximum emission phase)
  • 電力: 0.25 W mean (maximum emission phase)
  • 電力: 0.25 mW mean (minimum emission phase)

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
Modulation
Modulation type pulsed
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • bi-band, with helicoid antenna on the right side
チャンバの詳細 Subjects were seated in a soundproof Faraday screened room, wearing a 32-electrode helmet. The phone was placed on the electrode helmet close to the right ear using a plastic structure without metal parts.
ばく露装置の詳細 Two 24-ms sine wave sound stimuli of 500 Hz and 1 kHz in random order (250 times each) were heard through the phone once every second. The experimental sessions consisted of four phases: no RF emission, minimal RF emission (-30 dB), maximal RF emission, and again minimal RF emission. Control of the RF emission power was achieved using a communication simulator.
Additional information Every subject participated in experimental and control sessions at an interval of several days. The type of session was not known to the subject. In this study, only AEPs recorded in phase 1 and phase 3 were considered.
パラメータ
測定量 種別 Method Mass 備考
SAR 1.4 W/kg average over mass 指定なし 10 g maximum emission phase
電力 0.25 W mean - - maximum emission phase
電力 0.25 mW mean - - minimum emission phase

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)

Differences in the time and frequency domains of auditory evoked potentials (AEPs) with and without exposure to radiofrequency were observed for healthy persons and epileptic patients.
However, it was difficult to evaluate the modifications brought on by the radiofrequency and to deduce the effect of radiofrequency to human health. The alterations did not allow the authors to put forward some electrophysiological hypothesis.

研究の種別:

研究助成

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