, Volume 44, Issue 11–12, pp 981–983 | Cite as

Circabidian rhythm: its appearance and disappearance in association with a bright light pulse

  • K. Honma
  • S. Honma
Short Communications


A shift from circadian to circabidian periods or vice versa was observed in the rhythm of sleep and wakefulness under temporal isolation. The shift occurred in two subjects, 3 times in association with a single bright light pulse applied, 4 times in all. The finding suggests that the bright light pulse has an additional effect to the phase shift on the human circadian system.

Key words

Circadina rhythm circabidian rhythm sleep bright light temporal isolation 


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Copyright information

© Birkhäuser Verlag 1988

Authors and Affiliations

  • K. Honma
    • 1
  • S. Honma
    • 1
  1. 1.Department of PhysiologyHokkaido University School of MedicineSapporo(Japan)

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