Biological Cybernetics

, Volume 51, Issue 2, pp 87–92

Properties of a feedback model for the circadian clock of Hemideina thoracica (Orthoptera; Stenopelmatidae)

  • N. D. Christensen
  • R. D. Lewis
  • Philippa H. Gander


The single oscillator feedback model describing the circadian system of the nocturnal insect, Hemideina thoracica, (Gander and Lewis, 1979) has been developed and refined by restricting the range of parameter values which successfully simulate the known behaviour of this insect's circadian system. The model accounts for Aschoffs Law for nocturnal animals, and makes new predictions on the combined effects of temperature and constant light on the period of the free-running rhythm, which were verified experimentally. These simulations also indicate that the same general feedback model can be used to describe the circadian systems of other organisms.


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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • N. D. Christensen
    • 1
  • R. D. Lewis
    • 1
  • Philippa H. Gander
    • 1
  1. 1.Department of ZoologyUniversity of AucklandAucklandNew Zealand
  2. 2.MVSRD 239-3NASA Ames Research CenterMoffett FieldUSA

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