Entrainment of Circadian Rhythms by Sound in Passer domesticus

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Science  23 Dec 1966:
Vol. 154, Issue 3756, pp. 1579-1581
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 ½ 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.