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Satiety threshold: a quantitative model of maintained cocaine self-administration
1Division of Neuroscience, Department of Psychiatry, College of Medicine, University of Cincinnati, Cincinnati, OH 45267-0559, USA.
Brain Research
|September 14, 1999
Summary
This study developed a mathematical model for cocaine self-administration in rats, defining intervals by dose, half-life, and a satiety threshold. The model accurately predicted and prevented self-administration when cocaine levels were maintained above this threshold.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- Cocaine self-administration is a complex behavior.
- Existing models often rely on subjective psychological terms.
Purpose of the Study:
- To develop a quantitative mathematical model for cocaine self-administration in rats.
- To define the pharmacokinetic and pharmacodynamic parameters influencing self-injection intervals.
Main Methods:
- Developed a mathematical model based on cocaine dose, elimination half-life, and a cocaine satiety threshold.
- Used rat self-administration behavior as a bioassay.
- Validated the model by infusing cocaine at a calculated rate to maintain levels above the satiety threshold.
Main Results:
- The model identified three key parameters: dose, elimination half-life (approx. 8.2 min), and satiety threshold (approx. 1.7 mg/kg).
- A continuous infusion at the calculated elimination rate prevented cocaine self-administration.
- The model provides objective, quantitative descriptions of cocaine self-administration behavior.
Conclusions:
- A simple mathematical model can quantitatively describe cocaine self-administration in rats.
- Subjective concepts like craving or reinforcement are not necessary to explain this behavior.
- This model offers a novel bioassay for measuring cocaine pharmacokinetics and pharmacodynamics.