Abstract
Twelve hooded rats were trained to barpress for sucrose reinforcement on a variable-interval 2-min schedule. After response rates had stabilized, a respondent conditioning procedure was superimposed on the operant response baseline. The procedure involved presenting a 2-min light (CS) and following it with the delivery of response-independent food (US) while subjects barpressed for sucrose reinforcement. One group (n = 6) received a high-magnitude US (three food pellets) at the end of the 2-min light CS. A second group (n = 6) received a low-magnitude US (one food pellet) at the end of the 2-min light CS. Results showed that the low US magnitude produced an increase in barpresses during the CS. The high-magnitude US resulted in no significant change in operant baseline responding during the CS.
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The authors wish to thank Fred P. Rosen for his assistance in the analysis of the data.
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Hamm, R.J., Meltzer, D. The effect of the magnitude of response-independent food on conditioned enhancement. Bull. Psychon. Soc. 10, 339–342 (1977). https://doi.org/10.3758/BF03329354
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DOI: https://doi.org/10.3758/BF03329354