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Morphine and acceptability of putative reinforcers.
Pharmacology, Biochemistry, and Behavior
|April 1, 1983
Summary
Morphine increased saccharin solution intake in rats, regardless of water deprivation. This finding supports the role of opioid systems in driving motivation for rewards.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Animal Studies
Background:
- Opioid systems are implicated in reward processing and motivation.
- Understanding the neural mechanisms of incentive motivation is crucial for various fields.
Purpose of the Study:
- To investigate the effect of morphine on saccharin solution intake in rats.
- To explore the role of opioid involvement in incentive motivation.
Main Methods:
- Rats were presented with five concentrations of saccharin solutions.
- Morphine (2 mg/kg) was administered to rats under different hydration conditions (12-hr water deprived or not deprived).
- Saccharin intake was measured across concentrations and conditions.
Main Results:
- Intake of saccharin solutions across concentrations formed a preference-aversion curve.
- Morphine administration significantly increased saccharin intake in both water-deprived and non-deprived rats.
- The observed effects of morphine contrasted with the effects of naloxone, suggesting opioid involvement.
Conclusions:
- Opioid systems play a significant role in modulating incentive motivation for palatable substances.
- Morphine enhances the motivation to consume saccharin solutions, independent of hydration status.
- These findings reinforce the hypothesis of opioid involvement in the neurobiology of motivation.