Abstract
Many developing animals show an increasing preference for familiar companions and objects. They may also come to prefer things which are slightly different from the familiar. A model which shows how both processes can occur simultaneously is developed with particular reference to imprinting in birds. It shows how a biphasic curve would be obtained if preferences were measured in choice tests during the course of familiarization. The model predicts that shape of the preference curve will depend on the difference between the familiar and unfamiliar objects. It also predicts that the shape will be altered if inexperienced animals show a preference for one object over the other.
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