Prenatal auditory imprinting in chickens.

@article{Grier1967PrenatalAI,
  title={Prenatal auditory imprinting in chickens.},
  author={J B Grier and S. Allen Counter and W M Shearer},
  journal={Science},
  year={1967},
  volume={155 3770},
  pages={1692-3}
}
A batch of eggs was exposed to a patterned sound continuously from day 12 to day 18 of incubation, while a control group was hatched in the quiet. In a postnatal test all chicks tended to creep toward a stationary sound source, but the experimental group showed a preference for the sound heard during incubation. In a second test the experimental chicks followed a moving model longer when it emitted the familiar sound than when it emitted a novel sound or no sound at all. 

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