この研究は、オスのゴールデンハムスターのスキナー箱での学習に対する磁界（周波数10、20、30、または40 Hz；磁束密度0.1 T）への反復ばく露の影響を調べた。スキナー箱において、動物はレバーを押すことで食餌の報酬を得ることを学習する。結果として、最初の応答までの潜時には、磁界ばく露の影響は見られなかった；課題の遂行成績に対する磁界ばく露の影響は、10および20 Hzにおいては見られなかったが、30および40 Hzにおいて課題の学習が有意に改善された、と報告している。
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Male hamsters were assigned randomly to an exposure group (n=12) or sham exposure group (n=12).
The behavioural tests in the skinner box were performed on the following day after the last exposure. In the Skinner box the animals learned to press a lever to receive a food reward (unconditioned stimulus), which was associated with the sound of pressing the lever (conditioned stimulus). As a result a conditioned response was created (index of learning).
Modulation type: pulsed
ばく露時間: 30 min/day on 8 consecutive days
|Pulse width||1 ms|
|Rise time||200 µs|
|ばく露装置の詳細||coil placed under a polycarbonate container in which the animals were kept|
|Sham exposure||A sham exposure was conducted.|
The latency of the first response was not affected by exposure to the magnetic fields.
No significant effects on the performance of the task were observed in animals exposed to 10 and 20 Hz magnetic fields.
Exposure significantly improved the learning of the task in animals exposed to 30 and 40 Hz magnetic fields: The exposed animals needed fewer lever pressings to create the conditioned response and learned the task more quickly than sham-exposed animals.
The results indicate that the effects of magnetic fields on the process of learning in animals are dependent on the applied frequencies.