Nucleus Suprachiasmaticus: The Biological Clock in the Hamster?
- 16 January 1976
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 191 (4223) , 197-199
- https://doi.org/10.1126/science.942799
Abstract
Destruction of the suprachiasmatic nuclei in the golden hamster by bilateral radiofrequency lesions abolishes three well-documented circadian rhythms--locomotor activity, estrous cyclicity, and photoperiodic photosensitivity. Entrainment of these rhythms by light cycles fails in lesioned hamsters; females become persistently estrous; in both sexes locomotor activity becomes sporadic, confined primarily to the light instead of darkness, and is totally arrhythmic when lesioned animals are exposed to continuous darkness; the photoperiodic gonadal response (gonadal regression induced by short day lengths) is abolished; lesioned animals remain reproductively mature irrespective of photoperiodic treatment.Keywords
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