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

[雄ゴールデンハムスターの学習に対する磁界の影響] med./bio.

A magnetic field effect on learning in male golden hamsters.

掲載誌: Behav Processes 2009; 81 (1): 133-135

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研究目的(著者による)

To investigate the influence of repeated exposure to 10, 20, 30 or 40 Hz magnetic fields on the learning behavior of hamsters in a skinner box.

詳細情報

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).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 10–40 Hz
Modulation type: pulsed
ばく露時間: 30 min/day on 8 consecutive days

ばく露1

主たる特性
周波数 10–40 Hz
タイプ
  • magnetic field
ばく露時間 30 min/day on 8 consecutive days
Additional information 10 Hz, 20 Hz, 30 Hz, 40 Hz
Modulation
Modulation type pulsed
Pulse width 1 ms
Rise time 200 µs
ばく露装置
ばく露の発生源/構造
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.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 100 mT - - - -

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:
調査の時期:
  • ばく露後

研究の主なアウトカム(著者による)

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.

研究の種別:

研究助成

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