Self-administration of cocaine on a prog
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David C. S. Roberts; Elliot A. Loh; Gary Vickers
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Article
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1989
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Springer
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English
⚖ 414 KB
Intravenous cocaine self-administration behavior in rats was investigated using a progressive ratio (PR) schedule of reinforcement. The first response on the lever each day produced a drug infusion, whereupon the requirements of the schedule escalated with each reinforcement until the behavior extin