Journal of comparative physiology

, Volume 146, Issue 2, pp 245–253 | Cite as

Entrainment of the circadian system of the house sparrow: A population of oscillators in pinealectomized birds

  • Joseph S. Takahashi
  • Michael Menaker
Article

Summary

Removal of the pineal gland modifies the entrainment behavior of house sparrows. Abnormal entrainment occurs in pinealectomized sparrows exposed to ‘skeleton’ photoperiods (light cycles composed of 2 pulses of light per 24-h cycle). This abnormal entrainment depends upon the state of the locomotor activity (rhythmic or arrhythmic) before exposure to the light cycle, and upon the interval between the 2 pulses of light which constitute the skeleton photoperiod. The conditions that produce abnormal entrainment in pinealectomized birds are strongly correlated with those that produce 2 stable phases of entrainment to skeleton photoperiods in normal birds (‘bistability phenomenon’). These results suggest that after pinealectomy, there remains a population of oscillators whose combined output is reflected in the locomotor activity of individual sparrows.

Keywords

Locomotor Activity Stable Phasis Pineal Gland Light Cycle House Sparrow 

Abbreviations

LD 12

12 light-dark cycle with 12 h of light and 12 h of dark per 24-h cycle

CT

circadian time

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Joseph S. Takahashi
    • 1
  • Michael Menaker
    • 1
  1. 1.Institute of NeuroscienceUniversity of OregonEugeneUSA

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