抄録
The effect of noise on the psychomotor activity of rats was measured using cages equipped with rotating wheels. (CLEA, Type LC-900, Tokyo)
Sixty-four Wistar male rats were divided into 4 age groups-4, 7, 10, and 15 weeks old.
Subjects were exposed to wide octave-band noise at 100dB (C), continuously for 13-14 days. The control group 32 rats was kept less than 40dB (A), i.e., “silent conditions”.
The following result were obtained;
1. No signifficant difference in rat body weight was observed between the exposed and control groups at the end of the experiments.
2. Exposure to noise inhibited spontaneous activity in the 4- and 7-week-old groups, but activity increased in the 10- and 15-week-old groups.
3. It seems likely that noise effects psychomotor activity beginning between the eighth and tenth week in rats.
