Mrosovsky N, Janik D
Department of Zoology, University of Toronto, Ontario, Canada.
J Biol Rhythms. 1993 Spring;8(1):57-65. doi: 10.1177/074873049300800105.
Golden hamsters (Mesocricetus auratus) were kept in a light-dark cycle (LD 14:10). For 2 weeks, almost every day they were placed in a novel running wheel for 3 hr, starting 7 hr before dark onset. Most of the animals made several thousand wheel revolutions during this 3 hr. When these animals were subsequently transferred to a dark room, their activity was split into two components, one close to the time of the previous exposure to the novel wheel and the other close to the time when they had been active in the dark phase of the previous LD cycle. The two components fused after a few days in darkness. These observations show that nonphotic events are capable of causing major reorganizations of circadian activity patterns, despite the presence of an LD cycle.
金黄地鼠（Mesocricetus auratus）饲养于明暗周期（LD 14:10）环境中。持续2周，几乎每天在天黑前7小时将它们置于一个新的跑轮中3小时。在此3小时内，大多数动物能使跑轮转数千圈。随后将这些动物转移至暗室时，它们的活动分为两个部分，一部分接近之前接触新跑轮的时间，另一部分接近它们在前一个明暗周期黑暗阶段活跃的时间。在黑暗中几天后，这两个部分融合。这些观察结果表明，尽管存在明暗周期，非光事件仍能够引起昼夜活动模式的重大重组。
