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Hippocampal lesions do not alter the partial punishment effect.

S Brookes, J N Rawlins, J A Gray

    Experimental Brain Research
    |January 1, 1983
    PubMed
    Summary

    Rats receiving occasional footshock during training showed increased persistence in a goal-directed task, even after hippocampectomy. This partial punishment effect persisted unlike similar effects previously abolished by hippocampectomy.

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    Area of Science:

    • Neuroscience
    • Behavioral Psychology
    • Animal Models

    Background:

    • The partial punishment effect demonstrates enhanced persistence in tasks involving occasional punishment.
    • Hippocampal involvement in learning and memory is well-established.
    • Previous research indicated hippocampectomy abolishes similar effects like partial reinforcement extinction.

    Purpose of the Study:

    • To investigate the effect of hippocampectomy on the partial punishment effect in rats.
    • To compare the impact of hippocampectomy on partial punishment versus partial reinforcement extinction.

    Main Methods:

    • Rats were trained in an alley task with food reward, some receiving occasional footshock in the goalbox (partial punishment).
    • A test phase involved consistent food and footshock for all rats.
    • Hippocampal lesions were performed in a subset of the partially punished group.

    Main Results:

    • Rats previously exposed to partial punishment showed greater persistence in the test phase.
    • This partial punishment effect remained intact after hippocampectomy.
    • The effect was observed regardless of short or long inter-trial intervals.

    Conclusions:

    • The hippocampus is not essential for the partial punishment effect.
    • Partial punishment effects are distinct from partial reinforcement extinction effects regarding hippocampal dependency.
    • These findings challenge previous assumptions about hippocampal roles in certain learning paradigms.

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