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Proc Natl Acad Sci U S A. 1972 Jun; 69(6): 1583–1586.
PMCID: PMC426753

Circadian Rhythms in Drinking Behavior and Locomotor Activity of Rats Are Eliminated by Hypothalamic Lesions


Bilateral electrolytic lesions in the suprachiasmatic nuclei permanently eliminated nocturnal and circadian rhythms in drinking behavior and locomotor activity of albino rats. The generation of 24-hr behavioral rhythms and the entrainment of these rhythms to the light-dark cycle of environmental illumination may be coordinated by neurons in the suprachiasmatic region of the rat brain. Destruction of the medial preoptic area had no effect on 24-hr drinking rhythms.

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Selected References

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  • Kakolewski JW, Deaux E, Christensen J, Case B. Diurnal patterns in water and food intake and body weight changes in rats with hypothalamic lesions. Am J Physiol. 1971 Sep;221(3):711–718. [PubMed]
  • Stephan FK, Zucker I. Rat drinking rhythms: central visual pathways and endocrine factors mediating responsiveness to environmental illumination. Physiol Behav. 1972 Feb;8(2):315–326. [PubMed]
  • Zucker I. Light-dark rhythms in rat eating and drinking behavior. Physiol Behav. 1971 Feb;6(2):115–126. [PubMed]

Articles from Proceedings of the National Academy of Sciences of the United States of America are provided here courtesy of National Academy of Sciences


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