RT Journal Article SR Electronic T1 Characteristics of Behavior Controlled by Scheduled Injections of Drugs JF Pharmacological Reviews JO Pharmacol Rev FD American Society for Pharmacology and Experimental Therapeutics SP 307 OP 323 VO 27 IS 3 A1 R. T. Kelleher YR 1975 UL http://pharmrev.aspetjournals.org/content/27/3/307.abstract AB It has been well established that the injections of various classes of drugs can reinforce behavior in experimental animals; however, there is a need to characterize the properties of drugs as reinforcers. The maintenance of behavior by self-administration of drugs is determined by various conditions in addition to the direct effects of the drug itself. The present paper has emphasized the importance of the schedule of drug injections in determining how drugs function as reinforcers. In this context, it was shown that certain secondorder schedules provide a technique for establishing powerful control over behavior with drugs as diverse as cocaine, methohexital, and morphine. 1971, by The Williams & Wilkins Co.