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Nonphotic Phase Shifting in Hamster Clock Mutants
N. Mrosovsky
Departments of Psychology, Physiology and Zoology, University of Toronto, Toronto, Ontario M5S 1A1, Canada
Peggy A. Salmon
Departments of Psychology, Physiology and Zoology, University of Toronto, Toronto, Ontario M5S 1A1, Canada
Michael Menaker
Department of Biology, University of Virginia, Charlottesville, Virginia 22901
Martin R. Ralph
Departments of Psychology, Physiology and Zoology, University of Toronto, Toronto, Ontario M5S 1A1, Canada
Golden hamsters with the tau mutation were kept in the dark and induced to become active through confinement to a novel running wheel for 3 hr. The response of the mutants to this nonphotic phase-shifting stimulus differed from that of wild-type hamsters. The mutants showed larger phase shifts, and their phase response curves differed in shape, with an advance portion at about circadian time 24, a phase at which wild types show delays. The results establish that the tau mutation, in addition to its already known effects, alters the response of the circadian system to nonphotic events.
Key Words: activity hamster nonphotic phase response curve phase shift
Journal of Biological Rhythms, Vol. 7, No. 1,
41-49 (1992)
DOI: 10.1177/074873049200700104

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