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Journal of Biological Rhythms
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The Effect of Multiple Pulses of Light on the Circadian Phase Response of the Rat

Mark A. Stokes

Stephen Kent

School of Psychological Sciences, La Trobe University, Kingsbury Drive, Bundoora, Victoria, 3083, Australia

Stuart Maxwell Armstrong

Brain Sciences Institute, Swinburne University of Technology, John Street, Hawthorn, Victoria, 3122, Australia

Multiple pulses of light administered to humans have been reported to result in type 0 phase responses. These results suggest the underlying pacemaker to be nonsimple. At present, results with this type of protocol have only been reported for humans. Therefore, multiple pulses of light were administered to rats. Rats were exposed to one, two, three, or four pulses of light for 5 h (1000 lux) at successive 24-h intervals. Results did not suggest a type 0 phase response. Nonetheless, results with a second, third, or fourth light exposure were not fully predictable from a phase response curve derived from a single light pulse.

Key Words: circadian • pacemaker • phase response • period • multiple pulses • rat

Journal of Biological Rhythms, Vol. 14, No. 3, 172-184 (1999)
DOI: 10.1177/074873099129000579
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