この研究は、GSM携帯電話の信号と同様のパルス化無線周波信号（搬送波900MHz、217Hzで変調）がキンカチョウの脳の神経細胞に与える影響を調べた（34羽を麻酔下で実験；全部で脳の133箇所の脳活動を測定した）。その結果、ばく露により、脳の細胞の半分以上において、神経細胞活動の変化が生じた；ばく露に反応した細胞の大部分（76％）は、発火率を平均3.5倍上昇させた；その他の反応細胞では、自発的活動の発生率低下が見られた、と報告している。
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To investigate the effects of a pulsed radio frequency signal similar to the signal produced by global system for mobile communication (GSM) telephones on neurons of the avian brain.
| 周波数 | 900 MHz |
|---|---|
| タイプ |
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| 特性 |
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| ばく露時間 | continuous for 10 min |
| Modulation type | pulsed |
|---|---|
| Duty cycle | 12.5 % |
| Repetition frequency | 217 Hz |
| Pulse type | rectangular |
| ばく露の発生源／構造 | |
|---|---|
| チャンバの詳細 | A tuned resonant RF cavity of 3λ length was used (23.5 cm diameter, 100.5 cm long) made of perforated metal producing a standing wave and fitted with two tuned RF stubs each 16.5 cm (λ/2) from opposite ends and thus 2λ from each other: one for emitting the signal and one for monitoring the frequency and power of the signal being synchronized in phase and intensity to the emitted signal. |
| ばく露装置の詳細 | The anesthetized bird was mounted in a non-conducting plastic holder and placed inside the cavity such that its head was at the center exactly 1λ from the emitting stub and the demodulating stub. Consequently, the signal the bird's head received was exactly the signal at both of those locations. The amplified RF signal was switched between a matched load and the cable to the waveguide chamber by a single-pole, double-throw RF switch controlled by a digital signal from the computer program. |
| Additional information | To record from neurons in the brain of the bird, a glass micro-electrode of 1-2 µm tip diameter was inserted through a small hole (4 mm) in the skull, and a silver reference electrode was inserted beneath the skin along the back of the head. Arranging the electrodes along the long axis of the cavity prevented them from acting as a loop antenna and electrically stimulating the cells. |
The stimulation resulted in changes in the amount of neural activity by more than half of the brain cells. Most (76%) of the responding cells increased their rates of firing. The other cells exhibited a decrease in their rates of spontaneous activity.
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