Social Contact Reinforces Cocaine Self-Administration in Young Adult Male Rats: The Role of Social Reinforcement in Vulnerability to Drug Use by Mark A. Smith, Hannah S. Cha, Annie K. Griffith, Jessica L. Sharp

“…Young adult male rats were trained to self-administer cocaine in operant conditioning chambers with a guillotine door that could be opened to an adjacent compartment housing either a social partner or a non-social stimulus. …”
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Is it stress? The role of stress related systems in chronic food restriction-induced augmentation of heroin seeking in the rat by Firas eSedki, Zarish eAbbas, Staci eAngelis, Jeffrey eMartin, Tracey eD'Cunha, Uri eShalev

“…Here, male Long-Evans rats were trained to self-administer heroin for 10 days in operant conditioning chambers. Rats were then removed from the training chambers, and subjected to 14 days of unrestricted (sated rats) or a mildly restricted (FDR rats) access to food, which maintained their body weight at 90% of their baseline weight. …”
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