MODIFIABILITY OF THE CRITICAL PERIOD FOR THE DEVELOPMENT OF MATERNAL BEHAVIOR IN SHEEP AND GOATS 1) by LEONARD HERS HER, JULIUS B. RICHMOND, and A. ULRIC MOORE (College of Medicine, State University of New York; Behavior Farm Laboratory, Cornell University.) (Rec. 12-XII-1961) INTRODUCTION It has been demonstrated that in the development of many behavioral responses there exist certain critical stages in ontogeny during which particu- lar environmental conditions may influence specific types of behavior for long periods of time and even for life, whereas exposure to those same en- vironmental conditions at other stages has little or no effect. Critical periods probably vary in duration for different kinds of behavior and for different types of organisms, from the entire juvenile or adult stage to very brief but crucial periods of time. Recently there has been considerable interest in these critical periods. Most investigations in this area have been conducted under the label of i m p r i n t i n g. Several authors (HESS, 1959a; HIND, 1955) have suggested that the length of the critical period for imprinting is determined by the time of onset of a response incompatible with the imprinted behavior, rather than by
Behaviour – Brill
Published: Jan 1, 1963
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