Binkley S, Mosher K
Am J Physiol. 1986 Dec;251(6 Pt 2):R1156-62. doi: 10.1152/ajpregu.1986.251.6.R1156.
Circadian responses to photoperiod were studied in house sparrows (Passer domesticus) by subjecting them to 4-h light pulses and measuring the subsequent phases of their circadian rhythms. The direction and magnitude of phase shifts in response to 4-h light pulses following pretreatment with light-dark cycles (LD) 16:8 or LD 8:16 varied with time of day; advances (3.4 h) occurred when pulses were imposed in the late subjective night on both groups of birds; delays (-2.1 h) occurred when the pulses were imposed in the early subjective night on the LD 8:16 birds. The time profiles for responses to light pulses that scanned 24 h (phase-response curves) were modified by long and short photoperiod. Short photoperiod 1) increased amplitude (1.7 h), 2) increased time from the prior lights-out to the peak of advances (6 h), and 3) decreased the mean phase shift (0.9 h).
通过对家麻雀（Passer domesticus）施加4小时的光脉冲并测量其昼夜节律的后续相位，研究了家麻雀对光周期的昼夜反应。在经过16:8或8:16的明暗循环（LD）预处理后，对4小时光脉冲的相位移动方向和幅度随一天中的时间而变化；当在两组鸟类的主观深夜施加脉冲时，出现提前（3.4小时）；当在LD 8:16组鸟类的主观凌晨施加脉冲时，出现延迟（-2.1小时）。扫描24小时的光脉冲反应的时间曲线（相位反应曲线）受到长光周期和短光周期的影响。短光周期1）增加了幅度（1.7小时），2）增加了从前一晚熄灯到提前峰值的时间（6小时），3）降低了平均相位移动（0.9小时）。
