この研究は、低電力密度のパルス変調超高周波（UHF）電磁エネルギーをネコの頭部に照射し、脳幹誘発電位を記録した。搬送周波数は1.2–1.525 GHz、１回のばく露は60000パルスとした。結果として、誘発反応に必要な電力密度の平均は30 µW/cm²、ピーク値は60 mW /cm²であった：測定された電位は、アーチファクトではなく、神経的なものであることを確認した；電磁波吸収材でネコの全身、頭部または体幹をシールドする実験により、誘発反応を得るためには頭部のUHFばく露が必要であることが示された；実験した周波数範囲では、最高の周波数で誘発効果の低下が観察された；電力密度の変動は誘発電位に明確に影響した；偏波（脊髄に並行または垂直）は大きく影響しないように見えたが、明白ではない；パルス繰り返し周波数が約50パルス／秒を超えるまでは、これの変化で誘発反応は大きく変化しなかったが、超えると、一連の刺激で誘発される活動の重複が起こることが多い、と報告している。
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The study was designed to be a parametric study of the effect of low-intensity pulse modulated ultra high frequency (UHF) energy on the functioning of the central nervous system. In this report, it is demonstrated that pulse modulated UHF energy at low power densities evokes potentials in the brain stem. The required experimental conditions are defined.
| 周波数 | 1.2–1.525 GHz |
|---|---|
| ばく露時間 | more than 60000 pulses per session; exposures alternated with rest periods of 5 min |
| Additional information | 1.2 GHz, 1.3 Ghz; 1.425 GHz, 1.525 GHz |
| Modulation type | pulsed |
|---|---|
| Pulse width | 10 µs |
| Packets per second | 130 |
| Additional information |
12, 24, 36, 80, 130 pps |
| ばく露の発生源／構造 | |
|---|---|
| Distance between exposed object and exposure source | 0.5 m |
| チャンバの詳細 | non reflecting ecosorb test enclosure |
Evoked potentials in the brain stem were induced by illumination with pulse modulated UHF energy. The threshold power density necessary to evoke the responses was approximately 30 µW/cm² average and 60 mW/cm² peak. The results indicate that the potentials were neural rather than an artifact of the situation. Using an echosorb shield to cover the entire cat, or head, or body, it was found that the head must be exposed to the UHF energy in order to have an effect occur. Within the carrier-frequency range used (1.2-1.525 GHz), there seemed to be a reduction of effect at the highest frequency. Variation in power density has a distinct effect on the evoked potentials. Polarization of the energy, whether perpendicular or parallel to the spine, does not seem to have much effect though this is not unequivocal. As pulse-repetition frequency is changed, the evoked response does not change significantly until the pulse-repetition frequency is greater than approximately 50 pulses/sec. When greater than this, there is often an overlap of activity evoked by the series of stimuli.
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