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pubmed:abstractText |
Seasonal fluctuations in physiology and behavior depend on the duration of nocturnal melatonin secretion programmed by the circadian system. A melatonin signal of a given duration, however, can elicit different responses depending on whether an animal was previously exposed to longer or shorter photoperiod signals (i.e., its photoperiodic history). This report examined in male Siberian hamsters which of two aspects of photoperiod history--prior melatonin exposure or entrainment state of the circadian system - is critical for generating contingent responses to a common photoperiodic signal.
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pubmed:affiliation |
Department of Psychology, University of California, San Diego, La Jolla, CA 92093-0109, USA. mgorman@ucsd.edu
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