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

[聴覚記憶タスク時の小児の事象関連振動EEGに対する携帯電話の影響] med./bio.

Mobile phone effects on children's event-related oscillatory EEG during an auditory memory task.

掲載誌: Int J Radiat Biol 2006; 82 (6): 443-450

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研究目的(著者による)

To study the effects of electromagnetic fields emitted by mobile phones on the 1 - 20 Hz event-related brain oscillatory EEG responses in children performing an auditory memory task.

詳細情報

The stimuli were 8 acoustically presented Finnish nouns.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902 MHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • 電力: 0.25 W mean
  • SAR: 1.4 W/kg average over mass (1 g)
  • SAR: 1.98 W/kg peak

ばく露1

主たる特性
周波数 902 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Pulse width 0.577 ms
Repetition frequency 217 Hz
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 20 mm
ばく露装置の詳細 A standard GSM phone was mounted to the participant's head over the left posterior temporal region, comparable to normal use, with the antenna located about 20 mm from the head. The phone's loudspeaker was removed and the battery was replaced with a quieter one to prevent acoustic cues about the state of the phone.
Sham exposure A sham exposure was conducted.
Additional information Each EEG recording was subdivided into two 30-min segments, with the mobile phone turned on or off in a double-blind, counterbalanced protocol. The phone's condition was set by software on a computer via a cable disconnected before mounting.
パラメータ
測定量 種別 Method Mass 備考
電力 0.25 W mean - - -
SAR 1.4 W/kg average over mass 測定値 1 g -
SAR 1.98 W/kg peak 測定値 - -

Reference articles

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 data indicate that electromagnetic fields emitted by mobile phones have effects on brain oscillatory responses in children in the approximately 4 - 8 Hz and approximately 15 Hz EEG frequencies during cognitive processing.
The results do not allow any conclusions concerning the possible effects of long-term mobile phone use on cognition or health. The physiological mechanism underlying these effects on brain oscillatory responses remain unclear.

研究の種別:

研究助成

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