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

[エンコード検索タスク時のGSM電磁界のMEGへの影響] med./bio.

Effects of GSM electromagnetic field on the MEG during an encoding-retrieval task.

掲載誌: Neuroreport 2004; 15 (7): 1191-1194

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研究目的(著者による)

To study potential effects of GSM 1800 electromagnetic fields on verbal memory encoding by recording event-related magnetic fields from the brain (electrocortical magnetic fields caused by sensory, motor, or psychic events; measured via MEG) during subsequent memory retrieval.

詳細情報

After encoding words from a study list presented in the first phase (under exposure) subjects had to discriminate old from new words mixed together in a test list presented during the second phase (without exposure).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.87 GHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • 電力: 1 W peak
  • 電力: 0.25 W average over time
  • SAR: 0.61 W/kg average over mass (10 g) (according to CENELEC standard)
  • SAR: 1.14 W/kg average over mass (1 g) (according to ANSI norm)

ばく露1

主たる特性
周波数 1.87 GHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Additional information Reference article: Institut für Mobil- und Satellitenfunktechnik (IMST), Kamp-Lintfort/Germany: Dosimetrische Vermessung von DCS 1800-Mobiltelefonen. Technical report 1998.
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • antenna of a mobile phone
チャンバの詳細 The subjects were seated in a wooden chair in the center of a chamber (2 x 1.8 x 2 m) the walls of which were covered by foam pads preventing reflections.
ばく露装置の詳細 A GSM like signal was generated by a signal generator and fed to the antenna of a mobile phone which was located close to the left ear of the subjects in the 30° position according to CENELEC.
Additional information Each subject performed the experiment twice with either EMF or sham exposure (double blind) on separate days.
パラメータ
測定量 種別 Method Mass 備考
電力 1 W peak 測定値 - -
電力 0.25 W average over time 測定値 - -
SAR 0.61 W/kg average over mass 推定値 10 g according to CENELEC standard
SAR 1.14 W/kg average over mass 推定値 1 g according to ANSI norm

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:
  • ばく露後

研究の主なアウトカム(著者による)

Exposure to electromagnetic fields changed an early (350-400 ms) task-specific component of the event-related magnetic fields indicating an interference of electromagnetic fields and item encoding. Behavioural measures (reaction times, the rate of correctly detected new and correctly identified old words) were not significantly affected. Adverse health effects cannot be derived from these results.

研究の種別:

研究助成

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