Abstract
When ducklings have been imprinted to a moving stimulus, subsequent withdrawal of the stimulus usually leads to the emission of distress calls. Four Peking ducklings were imprinted and tested for the emission of distress calls under each of four different schedules of stimulus presentation and withdrawal. Although the total time for presentation and withdrawal was equal for the several schedules, fewer distress calls were emitted during short cycles of presentation and withdrawal than during long cycles.
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1. Supported by NIMH Grant MH 12824-01. We thank John Searle for his assistance and helpful suggestions.
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Hoffman, H.S., Stratton, J.W. Schedule factors in the emission of distress calls. Psychon Sci 10, 251–252 (1968). https://doi.org/10.3758/BF03331505
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DOI: https://doi.org/10.3758/BF03331505