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Circadian Rhythm Resetting in Sparrows: Early Response to Doublet Light Pulses

Biology Department, Temple University, Philadelphia, Pennsylvania 19122

Karen Mosher

Biology Department, Temple University, Philadelphia, Pennsylvania 19122

Circadian responses were studied using the perching activity of house sparrows (Passer domesticus). The sparrows were subjected to single or double 4-hr light pulses (the single pulses or the second pulses of the doublets scanned 24 hr) in the first cycle after previous entrainment to a light-dark cycle (LD 12:12). The differences in times at which the birds commenced perch- hopping in LD 12:12 before the pulses and in the five cycles immediately following the pulses were determined (phase shifts). A 24-hr time profile for phase shifts in response to single light pulses replicated our previous study: Early-night pulses delayed the rhythm ( —1.7 hr), while late-night pulses advanced the rhythm (+3.8 hr). After pretreatment with a light pulse that advanced the birds + 2.7 hr, the resetting curve was advanced. There were no delays; the range of average shifts was +0.1 hr to + 6.2 hr. After pretreatment with a light pulse that delayed the birds - 1.7 hr, the resetting curve was delayed. Average delays as much as -1.1 hr and advances up to + 2.1 hr were measured. The data for double pulses were interpreted from predictions made from single-pulse data.

Journal of Biological Rhythms, Vol. 2, No. 1, 1-11 (1987)
DOI: 10.1177/074873048700200101


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