Circadian phase response curves for dark pulses in the hamster |
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Authors: | Ziad Boulos Benjamin Rusak |
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Institution: | (1) Department of Psychology, Dalhousie University, B3H 4J1 Halifax, Nova Scotia, Canada;(2) Present address: Long Island Research Institute, Health Sciences Center 10T, State University of New York at Stony Brook, 11794 Stony Brook, New York, USA |
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Abstract: | Summary Hamsters maintained under constant illumination were exposed to 2- or 6-h pulses of darkness at various phases of their circadian activity rhythms. When presented around the time of activity onset, the pulses resulted in phase advances, and when presented toward the end of daily activity, they resulted in phase delays. Since others have shown that light pulses presented at the same phases in constant darkness cause phase shifts in the opposite directions, these results indicate that phase response curves for light and dark pulses are mirror images.Dark pulses also caused phase-dependent changes, both transient and long-lasting, in the period of the free-running rhythms, and a few pulses were immediately followed by splitting of the activity rhythms into two components. Such effects may reflect a differential responsiveness of two coupled oscillators to dark pulses.Abbreviations
CT
circadian time
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DD
constant dark
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LD
lightdark
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LL
constant light
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PRC
phase response curve
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SD
subjective day
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SN
subjective night
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period of a circadian rhythm
Supported by grants from the NSERC of Canada to B. Rusak and to G.V. Goddard. We are grateful to Dr. Goddard for his support and encouragement |
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