Abstract: Three quantities, circadian period, amount of activity, and ratio of activity time to rest time of circadian locomotor rhythms (C.L.R.) in the tree shrew,were measured under the influence of two constant light intensities. When light intensity was increased from 10 lx to 100 lx, the circadian period decreased, showing that Aschoff's rule may be valid for this day active species but does not tally with the facts of diurnal primate species and that the light's influence on the C.L.R. in the tree shrew is the same as in lower animals, the ratio of activity time to rest time was larger under 100 lx than under 10 lx of continuous light, but a consistent change in the amount of activity did not occur between both light intensities.

摘要： 根据“Aschoff rule”,昼行性动物近似昼夜节律周期的长度和光照强度呈负相关,活动时间与休息时间的比率以及活动量均与光照强度呈正相关。而夜行性动物的情况则相反(比宁,1964;Aschoff,1959,1960;Sollberger,1965)。这在爬行动物、鱼、鸟以及夜间活动的哺乳类已得到了肯定的证实,但对一些白天活动的哺乳类还不清楚。到目前为止,检查了7种白天活动的灵长类动物均不符合这条规律(Tokura et al.,1978,1979,1980)。