RELATIVE POTENCY OF CODEINE, METHADONE AND DIHYDROMORPHINONE TO MORPHINE IN SELF-MAINTAINED ADDICT RATS.
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Biomedical subjects
Publications and source records attributed to J R WEEKS.
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An operant behavioral study on morphine addiction utilized a self-injection technique for giving intravenous injections to relatively unrestrained rats. The rate of self-injection varied inversely with the dose. Morphine was a reinforcer that produced almost immediate satiation.
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