Conditioned Reinforcement in the Goldfish

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Science  28 Jun 1968:
Vol. 160, Issue 3835, pp. 1471-1472
DOI: 10.1126/science.160.3835.1471


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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