Temporal Order pp 279-280 | Cite as

Interaction between Two Circadian Clocks in the Rabbit and Their Main Input

  • A. C. Bobbert
  • D. J. Bruinvels
Conference paper
Part of the Springer Series in Synergetics book series (SSSYN, volume 29)


It was previously shown [review in 1] for the rabbit that photosensitivity of the visual system fluctuates according to a block-shaped circadian rhythm. The time courses of this rhythm after exposure to 24 hrs light-dark alternations or to constant environmental circumstances strongly suggest that this rhythm is governed by a central circadian mechanism with the properties of a double-oscillator. These 2 oscillators may correspond with the Morning- and Evening type oscillators which have been described for hamsters and other rodents [2,3]. This raised the following questions: — does the rabbit show corresponding circadian changes in food intake? If so, is there any indication that this rhythm also is controlled by a double-oscillator? And, in case of the latter, how do these separate oscillators respond to entrainment by light-dark regimens or to constant photic circumstances?




  1. 1.
    A.C. Bobbert and J. Brandenburg: “Characteristics of the Interaction Between the Central Circadian Mechanism and the Retina in Rabbits”. In Vertebrate Circadian Systems. Ed. by J. Aschoff, S. Daan and G. Groos. Springer Verlag Berlin-Heidelberg-New York, 52–61 (1982)Google Scholar
  2. 2.
    S. Daan and C. Berde: “Two Coupled Oscillators: Simulations of the Circadian Pacemaker in Mammalian Activity Rhythms”. J. Theor. Biol, 70, 297–313 (1978)CrossRefMathSciNetGoogle Scholar
  3. 3.
    M. Kawato and R. Suziki: “Two Coupled Neural Oscillators as a Model of the Circadian Pacemaker”. J. Theor. Biol., 86, 547–575 (1980)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • A. C. Bobbert
    • 1
  • D. J. Bruinvels
    • 1
  1. 1.Department of Physiology and Physiological PhysicsUniversity of LeidenLeidenThe Netherlands

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