Developmental appearance of light-dark entrainment in the rat

Marilyn J. Duncan, Mark J. Banister, Steven M. Reppert

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


Previous studies show that the developing circadian system is entrained by a maternal signal during the prenatal and early postnatal period. The present study investigated the developmental onset of retina-mediated, light-dark entrainment. Juvenile rats were exposed to phase-shifts in the light-dark cycle at different ages and the pineal N-acetyltransferase rhythm was monitored on postnatal day 10. The results show that retina-mediated, light-dark entrainment begins by postnatal day 6 and overrides maternal entrainment by postnatal day 8.

Original languageEnglish
Pages (from-to)326-330
Number of pages5
JournalBrain Research
Issue number1-2
StatePublished - Mar 26 1986

Bibliographical note

Funding Information:
This work was supported by Public Health Service Grant HD 14427 and March of Dimes Research Grant No. 1-945. S.M.R. is an Established Investigator of the American Heart Association.


  • circadian rhythm
  • entrainment
  • pineal gland
  • suprachiasmatic nucleus

ASJC Scopus subject areas

  • General Neuroscience
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology


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