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Science 28 June 1968:
Vol. 160. no. 3835, pp. 1471 - 1472
DOI: 10.1126/science.160.3835.1471
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Articles

Conditioned Reinforcement in the Goldfish

Kurt Salzinger 1, Steven J. Freimark 2, Stephen P. Fairhurst 2, and F. Dmitri Wolkoff 2

1 Department of Social Sciences, Polytechnic Institute of Brooklyn, Brooklyn, New York 11201, and Biometrics Research, New York State Department of Mental Hygiene
2 Department of Social Sciences, Polytechnic Institute of Brooklyn

Goldfish were trained to press a lever on a 10:1 fixed-ratio schedule of reinforcement. They were extinguished under three conditions. Responding was followed by (i) solenoid noise and water delivery formerly associated with food reinforcement, (ii) solenoid noise only, or (iii) nothing. The number of extinction responses was largest in condition 1, less in condition 2, and smallest in condition 3, thus providing evidence for conditioned reinforcement in goldfish.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)