Heroin self-administration in rats under a progressive ratio schedule of reinforcement
The synergistic effects of combining cocaine and heroin ("speedball") using a progressive-ratio schedule of drug reinforcement.
L -Tryptophan decreases the breaking point under a progressive ratio schedule of intravenous cocaine reinforcement in the rat
Intra-VTA baclofen attenuates cocaine self-administration on a progressive ratio schedule of reinforcement.
Effects of a variable-ratio reinforcement schedule with changing criteria on exercise in obese and nonobese boys.
Operant drinking of alcohol on a rate-contingent ratio schedule of reinforcement ☆
Attack behavior in a multiple fixed-ratio schedule of reinforcement
Beta-funaltrexamine affects cocaine self-administration in rats responding on a progressive ratio schedule of reinforcement.
An investigation of intravenous ethanol self-administration in rats using a fixed ratio schedule of reinforcement
Histories of Response Omission and Human Operant Behavior Under a Fixed-Ratio Schedule of Reinforcement