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Effects of amphetamine and methylphenidate on fixed-interval responding in the squirrel monkey
Pharmacology, Biochemistry, and Behavior
|July 1, 1977
Summary
D-amphetamine significantly altered operant responding in squirrel monkeys, unlike methylphenidate. These findings on stimulant effects on behavior may inform clinical research.
Area of Science:
- Behavioral neuroscience
- Psychopharmacology
Background:
- Operant conditioning is a fundamental learning process.
- Stimulant medications like d-amphetamine and methylphenidate are used clinically.
Purpose of the Study:
- To investigate the effects of d-amphetamine and methylphenidate on fixed-interval operant responding.
- To compare the behavioral impact of these two stimulant drugs.
Main Methods:
- Four young male squirrel monkeys were trained on a fixed-interval (80-sec) operant task with a limited hold (20-sec).
- Oral doses of d-amphetamine and methylphenidate were administered.
- Behavioral changes, including response rate and temporal patterning, were analyzed.
Main Results:
- Methylphenidate did not produce observable changes in the monkeys' behavior.
- D-amphetamine caused dose-related alterations in both the rate and temporal patterning of responses.
- The dosages used were comparable to or exceeded human clinical levels.
Conclusions:
- D-amphetamine, but not methylphenidate, significantly affects operant behavior in squirrel monkeys.
- These findings suggest differential psychopharmacological effects relevant to clinical applications.