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The effect of repeated pulses of light at the same time on period responses of the rat circadian pacemaker.

Stokes, Mark, Kent, Stephen and Armstrong, Stuart 2001, The effect of repeated pulses of light at the same time on period responses of the rat circadian pacemaker., Chronobiology international, vol. 18, no. 2, pp. 187-201, doi: 10.1081/CBI-100103185.

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Title The effect of repeated pulses of light at the same time on period responses of the rat circadian pacemaker.
Author(s) Stokes, MarkORCID iD for Stokes, Mark
Kent, Stephen
Armstrong, Stuart
Journal name Chronobiology international
Volume number 18
Issue number 2
Start page 187
End page 201
Publisher Pergamon Press
Place of publication Oxford, England
Publication date 2001-03
ISSN 0742-0528
Summary A consequence of simple velocity-based models is that, in response to light pulses, the circadian period should adjust inversely to phase. In addition, because of the interaction of circadian period and phase response, earlier circadian period changes should modify later circadian period changes. The literature contains few mentions of response curves of circadian period responses following light pulses. Rats were exposed to four pulses of light (60 minutes, 1000 lux) at the same circadian time, a minimum of 26 days apart; we assessed period responses and possible bias in the period-response curve. Modulation of circadian period following light-induced phase responses was examined by assessing the period of running wheel activity onset. Phase and circadian period were not consistently found to share an inverse relationship. Moreover, biases in initial period tended to be increased by the experimental protocol regardless of circadian time of pulse. Rats with a short initial (highvelocity) period had a lengthened period, while rats with a long initial period (low velocity) tended to have a reduce period. However, rats with a long initial period were phase delay biased, not phase advance biased. These results do not support a simple velocity model of the pacemaker.
Language eng
DOI 10.1081/CBI-100103185
Field of Research 060604 Comparative Physiology
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2001, by Marcel Dekker, Inc.
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Document type: Journal Article
Collection: School of Psychology
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