In a two-lever testing chamber, rats had concurrent access to intravenous amphetamine and brain stimulation reinforcers. Responding for each reinforcer was generally increased above baseline rates taken when only one reinforcer was available. Amphetamine stereotypy was observed, but did not interfere with rapid lever-pressing for brain stimulation.
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| http://dx.doi.org/10.1016/0091-3057(77)90214-3 | DOI Listing |
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