Effects of Early Environmental Complexity on the following Response in Chicks

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Abstract
Six groups, each consisting of 7 Vantress Broiler chicks, were reared in a complex environment, rich in sensory stimulation, from hatching until imprinting 3, 6, 9, 12, 15, or 18 hr. later. Another six groups of 7 each were reared in a restricted environment and imprinted at the same times. The strength of the following response was tested for all animals between 36 and 48 hr. after imprinting. The response of the chicks reared in the complex environment was distinctly stronger over the entire range. In addition, the “critical period” for these animals occurred earlier.

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