Effects of D-amphetamine on response acquisition with immediate and delayed reinforcement

Response acquisition is seen under immediate and delayed reinforcement procedures, and at all doses of d-amphetamine in rats. Operative-lever pressing increases or remains unaltered in the presence of a low dose of d-amphetamine. Higher doses generate an initial decrease in lever pressing. In the absence of d-amphetamine, responding occurs on the operative lever at immediate reinforcement. Doses of d-amphetamine fail to have a detrimental effect on the process of learning.