No abstract available
MeSH terms
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Animals
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Catheters, Indwelling
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Equipment and Supplies
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Feeding Behavior / drug effects
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Feeding Behavior / psychology
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Heroin / administration & dosage*
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Injections, Intravenous
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Injections, Intraventricular
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Jugular Veins
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Morphine / administration & dosage*
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Rats
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Rats, Inbred Strains
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Reinforcement Schedule
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Reinforcement, Psychology
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Self Administration
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Stereotaxic Techniques