Tokura H, Aschoff J
Pflugers Arch. 1978 Sep 29;376(3):241-3. doi: 10.1007/BF00584957.
Locomotor activity was recorded in singly caged pig-tailed macaques Macaca nemestrina in constant conditions with intensities of illumination varying between 0.003 lux and 100 lux. Each animal was kept in at least 5 different conditions for 2-3 weeks each. Three quantities of the circadian rhythm: the period, the duration of activity as opposed to rest, and the amount of activity per period, could be shown to be positively correlated with light intensity. As in 6 other diurnal primate species, these findings contradict the so-called circadian rule according to which opposite correlations should exist between the circadian parameters and light intensity in diurnal and in nocturnal species of animals.
在光照强度在0.003勒克斯至100勒克斯之间变化的恒定条件下，对单独饲养笼中的豚尾猕猴（Macaca nemestrina）的运动活动进行了记录。每只动物在至少5种不同条件下各饲养2 - 3周。昼夜节律的三个量：周期、活动与休息的持续时间以及每个周期的活动量，都被证明与光照强度呈正相关。与其他6种昼行性灵长类动物一样，这些发现与所谓的昼夜节律规则相矛盾，根据该规则，在昼行性和夜行性动物物种中，昼夜节律参数与光照强度之间应存在相反的相关性。
