In a shuttle-box self-stimulation paradigm, analgesic doses of morphine increase the amount of time a rat leaves rewarding brain stimulation on, without altering average OFF times. This paradigm may serve as a model for the euphoria induced by narcotic drugs and as a useful tool for evaluating the reinforcing effects of drugs.
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| http://dx.doi.org/10.1007/BF00426581 | DOI Listing |
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