Differential effects of dark pulses on the two components of split circadian activity rhythms in golden hamsters (original) (raw)
Summary
Single 6-h pulses of dark were presented to golden hamsters displaying split circadian activity rhythms in constant light. The differential responses of the split components immediately following a 6-h dark pulse suggests that each component has a separate and similar bidirectional phase response curve, similar in shape to that described by other investigators for non-split hamster activity rhythms. The steady-state phase shifts of the split components were more variable with accompanying changes in period, changes in the time-interval between components, and the presence of transients, reflecting the gradual re-establishment of the pre-pulse 180 ° phase relationship. In addition, dark pulse presentation sometimes resulted in the replacement of a single split component by a number of smaller, frequent bursts of activity; this indicates that there may be a population of tightly coupled oscillators underlying each split component.
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Abbreviations
CT :
circadian time
DD :
constant dark
LD :
light-dark
LL :
constant light
PRC :
phase response curve
τ:
period of circadian rhythm
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Authors and Affiliations
- Department of Zoology, University of Toronto, Toronto, Canada
Jodi G. Lees & N. Mrosovsky - Department of Psychology, University of Toronto, Toronto, Canada
N. Mrosovsky - Department of Psychiatry, Mount Sinai Hospital and University of Toronto, Toronto, Canada
J. D. Hallonquist
Authors
- Jodi G. Lees
- J. D. Hallonquist
- N. Mrosovsky
Additional information
A preliminary report of this work was given by Lees and Hallonquist (1982)
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Lees, J.G., Hallonquist, J.D. & Mrosovsky, N. Differential effects of dark pulses on the two components of split circadian activity rhythms in golden hamsters.J. Comp. Physiol. 153, 123–132 (1983). https://doi.org/10.1007/BF00610349
- Accepted: 01 June 1983
- Issue date: March 1983
- DOI: https://doi.org/10.1007/BF00610349