Summary
Rats of three strains were trained to press a bar for water on a DRL 20 schedule of reinforcement. Nicotine and amphetamine increased response rates in most experiments but both drugs occasionally depressed responding. In two of the strains there was a tendency for individual animals to be affected similarly by the two drugs.
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Morrison, C.F. A comparison of the effects of nicotine and amphetamine on DRL performance in the rat. Psychopharmacologia 12, 176–180 (1968). https://doi.org/10.1007/BF00401548
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DOI: https://doi.org/10.1007/BF00401548