Menaker M, Eskin A
Science. 1966 Dec 23;154(3756):1579-81. doi: 10.1126/science.154.3756.1579.
The circadian locomotor rhythm of house sparrows was entrained by a sound stimulus. The birds were maintained at a constant temperature in, dim green light. The entraining agent was 4 (1/2) 12 hours of tape-recorded bird song ,played each day. Variations in the response to this stimulus have been correlated with individual variations in free-running period. This is the first clear demonstration that a biological clock can be influenced by sound stimuli.
家麻雀的昼夜运动节律受声音刺激的调节。这些鸟被饲养在温度恒定、光线昏暗的绿色环境中。诱导因子是每天播放4（1/2）到12小时的鸟鸣录音带。对这种刺激的反应变化已与自由运行周期的个体差异相关联。这是生物钟可受声音刺激影响的首个明确证据。
