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After responding stabilized, pigeons averaged 98% of their responses on the pentobarbital\u2010biased key during training sessions preceded by pentobarbital, and they averaged 90% of their responses on the saline\u2010biased key during training sessions preceded by saline. In test sessions preceded by doses of pentobarbital, chlordiazepoxide, or ethanol, pigeons switched from responding on the saline\u2010biased key at low doses to responding on the pentobarbital\u2010biased key at higher doses (the dose\u2014response curve was quantal). High doses of phencyclidine produced responding on both keys, whereas pigeons responded almost exclusively on the saline\u2010biased key after all doses of methamphetamine. These and previous experiments using concurrent reinforcement schedules to study drug discrimination illustrate that the schedule of reinforcement is an important determinant of the shape of dose\u2014effect curves in drug\u2010discrimination experiments.<\/jats:p>","DOI":"10.1901\/jeab.1999.72-187","type":"journal-article","created":{"date-parts":[[2006,3,2]],"date-time":"2006-03-02T16:42:55Z","timestamp":1141317775000},"page":"187-204","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["DRUG DISCRIMINATION UNDER A CONCURRENT FIXED\u2010RATIO FIXED\u2010RATIO SCHEDULE"],"prefix":"10.1002","volume":"72","author":[{"given":"D. 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