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  • Title: Following and visual imprinting in ducklings across a wide age range.
    Author: Brown RT.
    Journal: Dev Psychobiol; 1975 Jan; 8(1):27-33. PubMed ID: 1233317.
    Abstract:
    Ducklings ranging in age from 20-125 hr were exposed to a moving silent object in an open circular apparatus until a criterion of 300 sec of following was met. All ducklings met the criterion, and age did not correlate with the time required. In subsequent choice tests most ducklings approached the imprinting object over a novel object, and age did not correlate with choice behavior. Results indicate that imprinting can occur over a fairly wide age range, and that the traditional critical period for imprinting may, in part, be an artifact of laboratory methods.
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