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Colpaert FC, Niemogeers CJE, Janssen PAJ. 
“The Narcotic Cue: Evidence for the Specificity of the Stimulus Properties of Narcotic Drugs”. 
Arch Int Pharmacodyn. 1975;218:268-276.
Various non-narcotic drugs with intrinsic stimulus properties were found not to be generalized with fentanyl treatment in rats trained to discriminate fentanyl (0.04 mg/kg, s.c., t-30') from its solvent (s.c., t-30'). In contrast, five typical narcotic analgesics yielded dose-dependent generalization with fentanyl treatment. The results evidence the specific character of the narcotic cue in rats.
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