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

[携帯電話による脳活動の非線形的変化] med./bio.

Nonlinear changes in brain electrical activity due to cell phone radiation.

掲載誌: Bioelectromagnetics 2003; 24 (5): 339-346

この研究は、携帯電話からの電磁界が脳の電気的活動に与える影響の可能性について、非線形モデルに基づく新しい分析方法を用いて調べた。ウサギの脳電図(EEG)を位相空間に埋め込み、再帰定量化解析(Recurrence Quantification Analysis: QRA)を用いてリカレンスプロットを計算・定量化し、個々のウサギのばく露期間と対照期間におけるEEGを比較した。ばく露電磁界は、ヒトの携帯電話使用時をシミュレートした(800 MHz帯域、最大放射電力600 mW)。その結果、10匹中の9匹で有意な影響が観察された;影響は、ばく露開始から約100ミリ秒後に始まり、約300ミリ秒間続いた;いずれの場合も、電磁界ばく露期間中、EEGのランダム性が増加した;放射アンテナを頭部から胸部へ移動し、脳の吸収エネルギーを最小化した場合、このような影響は見られなかった、と報告している。

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研究目的(著者による)

To study the effects of an electromagnetic field from a cellular telephone on brain electrical activity, using a novel analytical method based on a nonlinear model.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 824–849 MHz
Modulation type: pulsed
ばく露時間: intermittent, 2 s on/5 s off (one trial) for a total of 60 trials

ばく露1

主たる特性
周波数 824–849 MHz
タイプ
  • electromagnetic field
ばく露時間 intermittent, 2 s on/5 s off (one trial) for a total of 60 trials
Modulation
Modulation type pulsed
Additional information

TDMA

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • with external magnetic mount antennas
Distance between exposed object and exposure source 1 cm
チャンバの詳細 The rabbit was restrained in an acrylic box, 20 cm high, 18 cm x 48 cm at the base, tapering to 18 cm x 41 cm at the top, made of 1.3 cm Plexiglas and mounted in a wooden box made of 1.3 cm painted plywood lined with 1.3 cm thick Styrofoam.
ばく露装置の詳細 After call establishment, the transmission path of the signal was alternated (in less than 1 µs) between two antennas. One antenna was placed horizontally along the rabbit's midline, 1 cm above its head and the other antenna was 3 m away (producing the "field free" period). Antennas were external magnetic mount models with the ceramic magnet removed. Some experiments were performed with the head antenna repositioned parallel to one side of the rabbit, 1 cm from the thoracic region.
Additional information In separate sessions, the experiments were repeated using light as the stimulus. A weak red light was used as a positive control coming from a light emitting diode mounted 10 cm from the rabbit, and producing approx. 50 lumens at the corneal surface of the eye.
パラメータ
測定量 種別 Method Mass 備考
電力 600 mW maximum - - -

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 showed that radiation from a standard cellular telephone affected the brain electrical activity of rabbits exposed to the radiation under conditions that simulated normal human use of the telephone. No effect was seen when the possible contribution of the brain to the specific absorption rate (SAR) was minimized (by repositioning the radiating antenna from the head to the chest). It was concluded that the fields from standard cellular telephone can alter brain function as a consequence of absorption of energy by the brain.

研究の種別:

研究助成

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