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Related Experiment Videos

Time-dependent changes in amphetamine self-administration following frontal cortex ablations in rats.

S D Glick, R G Marsanico

    Journal of Comparative and Physiological Psychology
    |January 1, 1975
    PubMed
    Summary

    Frontal cortex removal in rats altered d-amphetamine self-administration. Initially, rats showed reduced sensitivity, followed by increased hypersensitivity to the drug's rewarding effects over time.

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    Area of Science:

    • Neuroscience
    • Behavioral Pharmacology

    Background:

    • The frontal cortex plays a crucial role in reward processing and drug-seeking behavior.
    • Understanding the temporal effects of brain lesions on drug reward is essential for addiction research.

    Purpose of the Study:

    • To investigate the time-dependent effects of frontal cortex ablation on d-amphetamine self-administration in rats.
    • To characterize the changes in sensitivity to the rewarding effects of d-amphetamine following frontal cortex removal.

    Main Methods:

    • Rats were trained to self-administer d-amphetamine intravenously.
    • Surgical removal of the frontal cortex was performed.
    • Self-administration rates were assessed at different postoperative time points (early and late).

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    Main Results:

    • In the early postoperative period (3-5 days), frontal rats exhibited higher rates of d-amphetamine self-administration.
    • In the later postoperative period (2-4 weeks), these rats showed lower rates of self-administration.
    • These findings suggest a biphasic change in sensitivity to d-amphetamine's rewarding effects.

    Conclusions:

    • Frontal cortex lesions induce time-dependent alterations in the rewarding effects of d-amphetamine.
    • Rats with frontal cortex damage initially display hyposensitivity, followed by hypersensitivity to d-amphetamine's rewarding properties.
    • These results highlight the dynamic role of the frontal cortex in modulating drug reward over time.