Shaping and Discriminative Control of Underwater Click Vocalizations in a California Sea Lion

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Science  24 Dec 1965:
Vol. 150, Issue 3704, pp. 1743-1744
DOI: 10.1126/science.150.3704.1743


A captive vea lion (Zalophus californianus) which had never before produced clicking sounds in the laboratory was first conditioned to vocalize in air and subsequently learned to emit underwater clicks. clicking was brought under control by differential reinforcement procedures. Vocalization as an indicator response may be useful in the comparative study of discriminative behavior.